A magnetic core constant temperature pressing and molding equipment

Abstract

The present invention provides a magnetic core constant temperature pressing and molding device, which forms a magnetic powder pressing and molding space by enclosing the inner wall of the avoidance groove of the workbench, the top of the top sleeve and the outer wall of the core, and through the annular flange at the lower end of the top sleeve and the spring sleeved on the top sleeve, the top sleeve moves downward under the action of the upper mold. At the same time, since a delivery pipeline for circulating heat-conducting medium is provided in the lower mold, the input end is connected to the annular flange through the transmission component, and the output end is connected to the regulating valve provided on the liquid inlet pipe of the delivery pipeline, so that when the top sleeve moves downward, it will automatically adjust the regulating valve to speed up the flow rate in the delivery pipeline, thereby improving the heat exchange efficiency of the delivery pipeline, adjusting the heat conduction effect according to the working conditions, ensuring that the temperature of the mold is maintained within the preset range, and realizing the temperature pressing process through a simple mechanical structure. The magnetic core constant temperature pressing and molding device of the present invention solves the problem in the prior art of the lack of a low-cost and simple-structured magnetic core constant temperature pressing and molding device.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic core processing, in particular to a magnetic core constant temperature pressing and molding device. Background Art

[0002] A magnetic core is a sintered magnetic metal oxide composed of a mixture of various iron oxides. For example, manganese-zinc ferrite and nickel-zinc ferrite are typical core materials. Manganese-zinc ferrite has high magnetic permeability and flux density, along with low losses. Nickel-zinc ferrite has extremely high resistivity and a low magnetic permeability of less than a few hundred Å. Ferrite cores are used in coils and transformers in various electronic devices.

[0003] In the prior art, a pressing process is usually used to press and shape the magnetic core. For example, raw material powder is filled into a mold cavity, and then a pressing head is used to extrude the filled powder so that the filled powder is formed in the mold cavity. The pressing device in the prior art usually includes a pressing head, a top sleeve, a core, a lower mold and a workbench. The lower mold is fixedly connected to the workbench. A mold cavity is provided on the lower mold. The top sleeve is inserted into the mold cavity. The core is inserted into the top sleeve. The core is located in the mold cavity. The core is fixedly connected to the workbench. The top surface of the top sleeve is lower than the top surface of the lower mold and the core. During operation, the raw material powder is filled into the mold cavity, and the pressing head is pressed into the mold cavity from the top. After compaction and molding, the pressing head moves upward and withdraws from the mold cavity. The top sleeve moves upward to eject the formed magnetic core from the mold cavity.

[0004] However, this pressing method produces a magnetic core with slightly poor structural strength, and it is brittle and easily damaged during transportation to the next process. Therefore, now, the magnetic core is usually pressed using warm pressing technology. That is, during the magnetic pressing process, the temperature control setting is used to keep the mold for pressing the magnetic core within a preset temperature range. Compared with the traditional pressing method, the green strength of the warm pressed parts is high, the pressing force required during pressing is low, and the demolding force is smaller. However, this method requires an additional set of intelligent temperature control equipment to automatically adjust the heating or cooling device by monitoring the mold temperature to adjust the mold temperature. However, the high cost of intelligent equipment increases the production cost of the magnetic core, and due to the complexity of the intelligent temperature control equipment, if the intelligent temperature control equipment is damaged, the maintenance is difficult and the cycle is long, which affects the production efficiency of the magnetic core. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a magnetic core constant temperature pressing and molding device, aiming to solve the problem in the prior art of the lack of a low-cost and simple-structured magnetic core constant temperature pressing and molding device.

[0006] The magnetic core constant temperature pressing and molding equipment proposed in the present invention includes a workbench, a core arranged in a receiving groove of the workbench, a top sleeve sleeved on the outside of the core, and a lower mold sleeved on the outside of the top sleeve. The lower mold is provided with an avoidance groove for accommodating the top sleeve. The inner wall of the avoidance groove, the top of the top sleeve and the outer wall of the core enclose a molding space, so that magnetic powder is pressed and molded by the upper mold in the molding space.

[0007] A delivery pipeline for circulating a heat-conducting medium is further provided in the lower mold, and a liquid inlet pipe and a liquid outlet pipe of the delivery pipeline pass through the workbench and are connected to a temperature regulating assembly provided on one side of the workbench;

[0008] The accommodating groove is provided with a first step and a second step provided outside the first step, the first step is provided with a spring, the lower end of the top sleeve is provided with an annular flange, the spring is sleeved on the top sleeve with the top abutting against the bottom of the annular flange, and the bottom abutting against the first step;

[0009] The temperature adjustment assembly includes a regulating valve provided on the liquid inlet pipe and a transmission component connected to the regulating valve, wherein the output end of the transmission component is connected to the regulating valve, and the input end is connected to the annular flange;

[0010] When the upper mold moves downward to press the magnetic powder in the molding space, the lower mold will continue to move downward until the annular flange abuts against the second step. During this process, under the action of the spring, the upper mold and the lower mold simultaneously press the magnetic powder, and the lower mold moves downward to transmit the displacement to the transmission component through the input end, so that the transmission component adjusts the regulating valve through the output end, thereby adjusting the flow rate of the heat-conducting medium in the delivery pipeline.

[0011] The above-mentioned magnetic core constant temperature pressing and molding equipment forms a molding space by enclosing the inner wall of the avoidance groove of the workbench, the top of the top sleeve and the outer wall of the core, so that the magnetic powder is pressed and molded by the upper mold in the molding space, and by arranging an annular flange at the lower end of the top sleeve and a spring sleeved on the top sleeve, when the upper mold is pressed down and the force is large enough, the top sleeve will also move downward. At the same time, the force of the spring on the top sleeve causes the magnetic powder to be subjected to pressing forces in both the upper and lower directions in the molding space, thereby improving the pressing and molding effect of the magnetic powder. In addition, since a conveying pipeline for circulating a heat-conducting medium is provided in the lower mold, when the magnetic powder is pressed, the conveying pipeline for circulating the heat-conducting medium is used to ensure that the surrounding environment of the magnetic powder is at a specific temperature, thereby realizing the pressing of the magnetic powder by temperature pressing technology. In addition, the input end of the transmission component is connected to the annular flange, and the output end is connected to the regulating valve provided on the liquid inlet pipe of the conveying pipeline, so that when the top sleeve moves downward under the action of the upper mold, the displacement is transmitted to the regulating valve, and the regulating valve accelerates the flow rate of the heat-conducting medium in the conveying pipeline, thereby improving the heat conduction effect. Since the temperature of the mold will change dramatically during the pressing of the magnetic powder, the regulating valve is set to be linked with the top sleeve, so that when the magnetic powder is pressed, the flow rate of the heat-conducting medium in the conveying pipeline is automatically adjusted, and then the heat conduction effect is adjusted according to the working conditions, thereby ensuring that the temperature of the mold is always maintained within the preset range. When the pressing is continued for a period of time, after the pressing is completed, there is no longer severe extrusion friction between the upper mold, the top sleeve and the magnetic powder, and no large amount of heat is generated. At this time, the upper mold moves upward under the action of external force, and the top sleeve returns to the upper position under the action of the spring, and continues to move upward under the action of external force to push the pressed magnetic core out of the molding space, thereby transmitting the displacement to the regulating valve, so that the regulating valve adjusts the flow rate in the conveying pipeline to the initial insulation and energy-saving state again, thereby saving costs. Therefore, the magnetic core constant temperature pressing and molding equipment, through a simple mechanical structure design, intelligently adjusts the flow rate of the heat transfer medium in the delivery pipeline according to different working conditions of magnetic powder pressing, so that the temperature of the mold is always maintained within a specific range. Because it is a purely mechanical structure and simple, it is low in cost and maintenance costs, and is easy to repair. Furthermore, the present invention solves the problem of the lack of a low-cost and simple structured magnetic core constant temperature pressing and molding equipment in the prior art.

[0012] In addition, the magnetic core constant temperature pressing and molding equipment proposed in the present invention may also have the following additional technical features:

[0013] Preferably, the transmission component includes a first gear connected to the regulating valve control shaft, a worm arranged on one side of the first gear, and a rack arranged on one side of the worm, one end of the worm is adapted to the first gear, and the other end is provided with a second gear adapted to the rack, one side of the rack extends outward through the workbench and is connected to the annular flange, so that the rack moves up and down with the top sleeve.

[0014] Preferably, the liquid infusion pipeline includes a first pipeline segment, a second pipeline segment and a third pipeline segment distributed along the axis of the lower mold and surrounding the axis of the lower mold from top to bottom. The first pipeline segment is connected to the liquid outlet pipe, and the third pipeline segment is connected to the liquid inlet pipe. The pipeline diameter of the first pipeline segment is consistent with the pipeline diameter of the third pipeline segment, and the pipeline diameter of the second pipeline segment is smaller than the pipeline diameter of the first pipeline segment.

[0015] Preferably, the first pipeline segment, the second pipeline segment and the third pipeline segment have the same height, the spacing between adjacent pipelines in the first pipeline segment and the third pipeline segment is the same, and the spacing between adjacent pipelines in the second pipeline segment is smaller than the spacing between adjacent pipelines in the first pipeline segment.

[0016] Preferably, the pipelines of the first pipeline segment and the third pipeline segment are spirally arranged in the lower mold along the axis of the lower mold.

[0017] Preferably, the second pipeline segment includes multiple pipeline units, the number of which is an odd number, and any pipeline unit is composed of a pipeline serpentinely coiled from left to right along the axis of the lower mold, and one end of the first and last pipeline units is respectively connected to the head end or tail end of the first pipeline segment and the third pipeline segment, and the two ends of any other pipeline unit are respectively connected to the head end or tail end of the adjacent pipeline unit.

[0018] Preferably, a first delivery pipe for delivering the heat-conducting medium is also provided on the inner side of the core, and the liquid inlet pipe and the liquid outlet pipe of the first delivery pipe are arranged in a staggered double helix along the axis of the core, and the liquid inlet pipe and the liquid outlet pipe of the first delivery pipe are connected to each other near one end of the top of the core.

[0019] Preferably, a second delivery pipe is provided in the top sleeve, and one end of the liquid inlet pipe and the liquid outlet pipe of the second delivery pipe are circumferentially arranged around the axis of the top sleeve and connected to each other, and the other end is vertically arranged along the axis direction.

[0020] Preferably, a convex block is provided on a side of the first delivery pipe close to the top of the core, and a convex block is also provided on a side of the second delivery pipe close to the top of the top sleeve.

[0021] Preferably, the magnetic core constant temperature pressing and molding equipment further includes a supply device for providing the heat-conducting medium to the infusion pipeline at a stable pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a magnetic core constant temperature pressing and molding device according to an embodiment of the present invention;

[0023] Figure 2for Figure 1 A partial cross-sectional view of

[0024] Figure 3 This is a structural diagram of a magnetic core constant temperature pressing and molding device provided in one embodiment of the present invention, which includes a hidden temperature adjustment component and a workbench;

[0025] Figure 4 This is a schematic structural diagram of a temperature adjustment assembly proposed in one embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the delivery pipeline after being materialized in one embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the first delivery pipeline after being materialized in one embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the structure of the second delivery pipeline after being materialized according to one embodiment of the present invention.

[0029] Description of main component symbols:

[0030]

[0031]

[0032] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0033] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] See also Figures 1 to 7 , shown is a magnetic core constant temperature pressing and molding device in an embodiment of the present invention, comprising a workbench 10, a core 20 disposed in a receiving groove 11 of the workbench 10, a top sleeve 30 sleeved on the outside of the core 20, and a lower mold 40 sleeved on the outside of the top sleeve 30. The lower mold 40 is provided with an avoidance groove 41 for accommodating the top sleeve 30. The inner wall of the avoidance groove 41, the top of the top sleeve 30, and the outer wall of the core 20 enclose a molding space, so that the magnetic powder is pressed and molded by the upper mold in the molding space, wherein:

[0037] A delivery pipeline 50 for circulating a heat-conducting medium is further provided in the lower mold 40. A liquid inlet pipe 51 and a liquid outlet pipe 52 of the delivery pipeline 50 pass through the workbench 10 and are connected to a temperature adjustment assembly 60 provided on one side of the workbench 10.

[0038] The accommodating groove 11 is provided with a first step 111 and a second step 112 provided outside the first step 111. A spring 70 is provided on the first step 111. The lower end of the top sleeve 30 is provided with an annular flange 31. The spring 70 is sleeved on the top sleeve 30 with the top abutting against the bottom of the annular flange 31 and the bottom abutting against the first step 111.

[0039] The temperature adjustment assembly 60 includes a regulating valve 61 provided on the liquid inlet pipe 51 and a transmission component 62 connected to the regulating valve 61 . The output end of the transmission component 62 is connected to the regulating valve 61 , and the input end is connected to the annular flange 31 .

[0040] When the upper mold moves downward to press the magnetic powder in the molding space, the lower mold 40 will continue to move downward until the annular flange 31 abuts against the second step 112. During this process, under the action of the spring 70, the upper mold and the lower mold 40 simultaneously press the magnetic powder, and the lower mold 40 moves downward to transmit the displacement to the transmission component 62 through the input end, so that the transmission component 62 adjusts the regulating valve 61 through the output end, thereby adjusting the flow rate of the heat-conducting medium in the delivery pipeline 50.

[0041] It can be understood that during specific use, a molding space is formed by enclosing the inner wall of the avoidance groove 41 of the workbench 10, the top of the top sleeve 30 and the outer wall of the core 20, so that the magnetic powder is pressed and molded by the upper mold in the molding space, and by providing an annular flange 31 at the lower end of the top sleeve 30 and a spring 70 mounted on the top sleeve 30, when the upper mold is pressed down and the force is large enough, the top sleeve 30 will also move downward. At the same time, the force exerted by the spring 70 on the top sleeve 30 causes the magnetic powder to be subjected to pressing forces in both the upper and lower directions in the molding space, thereby improving the pressing and molding effect of the magnetic powder. In addition, since a conveying pipeline 50 for circulating a heat-conducting medium is provided in the lower mold 40, when the magnetic powder is pressed, the conveying pipeline 50 for circulating a heat-conducting medium ensures that the surrounding environment of the magnetic powder is at a specific temperature, thereby realizing the pressing of the magnetic powder by the warm pressing technology. In addition, the input end of the transmission component 62 is connected to the annular flange 31, and the output end is connected to the regulating valve 61 provided on the liquid inlet pipe 51 of the delivery pipeline 50, so that when the top sleeve 30 moves downward under the action of the upper mold, the displacement will be transmitted to the regulating valve 61, and the regulating valve 61 is used to accelerate the flow rate of the heat-conducting medium in the delivery pipeline 50, thereby improving the heat conduction effect. Since the temperature of the mold will change dramatically during the pressing of the magnetic powder, the regulating valve 61 is provided in conjunction with the top sleeve 30, so that when the magnetic powder is pressed, the flow rate of the heat-conducting medium in the delivery pipeline 50 will be automatically adjusted, thereby achieving targeted The heat conduction effect is adjusted according to the working conditions, thereby ensuring that the temperature of the mold is always maintained within a preset range. When the pressing is continued for a period of time, after the pressing is completed, there is no longer severe extrusion friction between the upper mold, the top sleeve 30 and the magnetic powder, and thus no large amount of heat is generated. At this time, the upper mold moves upward under the action of an external force, and the top sleeve 30 is reset upward under the action of the spring 70, and continues to move upward under the action of the external force to push the pressed magnetic core out of the molding space, and then transmits the displacement to the regulating valve 61, so that the regulating valve 61 adjusts the flow rate in the conveying pipeline 50 to the initial heat preservation and energy-saving state again, thereby saving costs. Therefore, the magnetic core constant temperature pressing and molding equipment realizes the intelligent adjustment of the flow rate of the heat-conducting medium in the conveying pipeline 50 according to the different working conditions of the magnetic powder pressing through a simple mechanical structure design, so that the temperature of the mold is always maintained within a specific range. And because it is a purely mechanical structure and has a simple structure, its own cost is low, and the maintenance cost is low and the repair is simple. Furthermore, the present invention solves the problem in the prior art of the lack of a low-cost and simple-structured magnetic core constant temperature pressing and molding equipment.

[0042] By way of example and not limitation, in some optional embodiments, the transmission component 62 includes a first gear 621 connected to the control shaft of the regulating valve 61, a worm 622 arranged on one side of the first gear 621, and a rack 623 arranged on one side of the worm 622. One end of the worm 622 is adapted to the first gear 621, and the other end is provided with a second gear 624 adapted to the rack 623. One side of the rack 623 extends outward through the workbench 10 and is connected to the annular flange 31, so that the rack 623 moves up and down with the top sleeve 30. Specifically, by connecting one side of the rack 623 to the annular flange 31, when the top sleeve 30 moves up and down, it will also move up and down with the rack 623. The up and down movement of the rack 623 drives the second gear 624 to rotate forward or reverse, thereby causing the worm 622 to rotate forward or reverse. Since the worm 622 is arranged on the side of the first gear 621 and is adapted to the first gear 621, the first gear 621 is rotated forward or reversed, thereby causing the control shaft of the regulating valve 61 to rotate forward or reverse, thereby realizing the function of the regulating valve 61 to automatically adjust the flow rate of the heat-conducting medium in the conveying pipe 50 according to different working conditions of the magnetic powder pressing. In addition, because the top sleeve 30 will move upward under the action of external force to eject the magnetic core, the flow rate in the conveying pipe 50 controlled by the regulating valve 61 may be less than the initial state. However, the top sleeve 30 will quickly reset after moving, so this state lasts for a very short time and has little impact on the temperature of the mold, and the temperature of the mold remains within a specific range. In addition, in a specific implementation, the protruding section of the rack 623 can be placed below the annular flange 31, not connected to the annular flange 31, and a groove is provided on the first step 111. The bottom of the chute where the rack 623 moves up and down in the workbench 10 is provided with a spring 70. When the upper mold is pressed down, the annular flange 31 presses the protruding section of the rack 623 downward and squeezes the spring 70 until the protruding section of the rack 623 moves into the groove. When the upper mold is removed from the mold under the action of external force and the top sleeve 30 continues to move upward, the spring 70 causes the rack to move upward and reset. By adopting this method, it is possible to avoid the situation where the regulating valve 61 adjusts the flow rate in the delivery pipeline 50 to be less than the initial state. It should be noted that, according to the on-site distribution setting, the temperature regulating assembly 60 can not only be set on one side of the workbench 10, but also a accommodating space can be opened inside the workbench 10. The temperature regulating assembly 60 is set inside the workbench 10, thereby facilitating the protection of the transmission components 62 and the like from damage due to external collisions, and the appearance is more beautiful.

[0043] In addition, the liquid infusion pipeline 50 includes a first pipeline segment 53, a second pipeline segment 54, and a third pipeline segment 55, which are arranged along the axis of the lower mold 40 and surround the axis of the lower mold 40 from top to bottom. The first pipeline segment 53 is connected to the liquid outlet pipe 52, and the third pipeline segment 55 is connected to the liquid inlet pipe 51. The pipeline diameter of the first pipeline segment 53 is the same as the pipeline diameter of the third pipeline segment 55, and the pipeline diameter of the second pipeline segment 54 is smaller than the pipeline diameter of the first pipeline segment 53. Specifically, the second pipeline segment 54 is located in the lower mold 40 outside the magnetic powder when the top sleeve 30 is pressed in the upper mold until the annular flange 31 abuts the first step 111. By adjusting the diameter of the second pipe section 54, the flow rate in the second pipe section 54 is greater than the flow rate in other pipe sections under the premise that the supply equipment provides the heat-conducting medium to the conveying pipeline 50 at a stable pressure, that is, the external pressure remains unchanged. As a result, when the regulating valve 61 increases the flow rate in the conveying pipeline 50, turbulence is more likely to be generated in the second pipe section 54, and the turbulence will increase the heat conduction effect of the heat-conducting medium, that is, enhance the heat exchange effect. Moreover, due to the position setting of the second pipe section 54, the temperature of the lower mold at the second pipe section 54 changes most dramatically during magnetic powder pressing. Therefore, through such targeted setting, the heat exchange efficiency here is improved, and the temperature here is guaranteed to be within a specific range. In addition, although turbulence has the effect of enhancing the heat exchange of the heat transfer medium, it will produce a large mechanical energy loss, so the supply equipment needs to do more work, which increases the energy consumption of the supply equipment. Therefore, the diameter of the second pipe section 54 is set to be smaller than the first pipe section 53 and the third pipe section 55 only at a specific position, so that even if the regulating valve 61 increases the flow rate of the delivery pipeline 50, turbulence will still not be generated in the first pipe section 53 and the third pipe 55, thereby reducing the energy consumption of the supply equipment.

[0044] Specifically, the first pipe segment 53, the second pipe segment 54, and the third pipe segment 55 are of the same height, and the spacing between adjacent pipes in the first pipe segment 53 and the third pipe segment 55 is the same. The spacing between adjacent pipes in the second pipe segment 54 is smaller than the spacing between adjacent pipes in the first pipe segment 53. To ensure structural strength, the spacing between adjacent pipes in the cooling pipeline, i.e., the delivery pipeline 50, needs to be greater than a certain threshold, which is proportional to the pipe diameter. Therefore, due to the smaller pipe diameter of the second pipe segment 54, more pipes can be distributed under the same height. Although the pipe diameter of the second pipe segment 54 is smaller, the number of pipes is greater than that of the first pipe segment 53 and the third pipe segment 55. Therefore, the surface area of ​​the second pipe segment 53 is actually larger, and the cooling effect in the second pipe segment 53 is better.

[0045] Additionally, the first and third pipe sections 53, 55 are spirally arranged within the lower mold 40 along the axis of the lower mold 40. By spirally arranging the first and third pipe sections 53, 55, the pipes are evenly and densely distributed on the lower mold 40, ensuring efficient heat exchange at the lower mold 40.

[0046] Specifically, the second pipeline segment 54 includes multiple pipeline units 541, and the number of pipeline units 541 is an odd number. Any pipeline unit 541 is composed of a pipeline that is serpentine from left to right along the axis of the lower mold 40. One end of the first and last pipeline units 541 is respectively connected to the head end or tail end of the first pipeline segment 53 and the third pipeline segment 55, and the two ends of any other pipeline unit 541 are respectively connected to the head end or tail end of the adjacent pipeline unit 541. By adjusting the distribution shape of the pipe units 541 in the second pipe section 54 to be serpentine, the flow direction of the heat-conducting medium is constantly changing when it flows into the second pipe section 54, thereby making it easier to generate turbulence in the second pipe section 54. Therefore, by setting the pipe diameter and pipe distribution of the second pipe section 54, the flow velocity threshold for generating turbulence in the second pipe section 54 is lowered, thereby making the adjustment range of the regulating valve 61 wider, so that the regulating valve 61 can more easily ensure that while turbulence is generated in the second pipe section 54, the flow state of the heat-conducting medium in the first pipe section 53 and the third pipe section 55 remains in a laminar state.

[0047] By way of example and not limitation, in some optional embodiments, a first delivery pipe 21 for delivering a heat-conducting medium is further provided on the inner side of the core 20. The liquid inlet pipe 51 and the liquid outlet pipe 52 of the first delivery pipe 21 are arranged in a staggered double helix along the axis of the core 20, and the liquid inlet pipe 51 and the liquid outlet pipe 52 of the first delivery pipe 21 are interconnected near one end of the top of the core 20. During the pressing of magnetic powder, in addition to the inner wall of the avoidance groove 41 of the lower mold 40, the outer wall of the core 20 also has a certain contact area with the magnetic powder. Therefore, the core 20 also needs to achieve temperature control through the heat-conducting medium in the first delivery pipe 21. Since the contact area between the outer side of the core 20 and the magnetic powder is smaller than the contact area between the inner wall of the avoidance groove 41 and the magnetic powder, the heat generated here during the pressing of the magnetic powder is also smaller, and thus the temperature change here will not be very drastic. Therefore, the heat exchange efficiency here can be met by the first delivery pipe 21 evenly distributed in a double helix. In addition, since the cross-sectional area of ​​the core 20 is smaller than that of the lower mold 40 , it is not suitable to set a pipeline section such as the second pipeline section 54 to be consistent with the first delivery pipeline 21 .

[0048] Furthermore, a second delivery pipe 31 is provided within the top sleeve 30. The inlet pipe 51 and outlet pipe 52 of the second delivery pipe 31 are arranged circumferentially around the axis of the top sleeve 30 and interconnected at one end, and are arranged vertically along the axis at the other end. Of course, the top of the top sleeve 30 also has a certain contact area with the magnetic powder. Therefore, the heat exchange requirement can be met by providing the second delivery pipe 31 with two inner and outer pipes on one side of the top of the top sleeve. Of course, a pipe with a similar distribution to the second delivery pipe 31 can also be provided at the upper mold to meet the heat exchange requirements at the upper mold. Furthermore, it should be noted that because the contact area between the top sleeve 30 and the upper mold with the magnetic powder is relatively small, and the first and third pipe sections 53 and 55 on the lower mold 40 are distributed over a wide range, the first and third pipe sections 53 and 55 contact the upper mold and the top sleeve 30 through the inner wall of the avoidance groove 41, resulting in a certain degree of heat exchange efficiency between the upper mold and the top sleeve 30. Therefore, even without providing pipes for transmitting heat-conducting medium between the upper mold and the top sleeve 30, it is still possible to ensure that the magnetic powder is within a specific temperature range during compaction.

[0049] Additionally, a bump is provided on the side of the first delivery conduit 21 near the top of the core 20, and a bump is also provided on the side of the second delivery conduit 31 near the top of the top sleeve 30. By providing certain bumps within the conduits and adjusting the flow rate accordingly, it is possible to make some of the liquid flow within the conduits more turbulent, thereby improving the heat exchange efficiency at the core 20 and top sleeve 30. However, due to the size of the magnetic core formed by magnetic powder compaction, the top sleeve 30 and core 20 are relatively small, and thus the first and second delivery conduits 21, 31 are also relatively small, resulting in even smaller bumps. Due to the existence of the first conveying pipe 21 and the second conveying pipe 31, the core 20 and the top sleeve 30 need to be manufactured by 3D printing. However, the accuracy of ordinary 3D printing technology is limited, and it is not possible to form a bump of this size in the pipe. If high-precision 3D printing is used, the cost will increase exponentially. Therefore, in actual application, the fluid flow state at the first conveying pipe 21 and the second conveying pipe 31 will not be changed by setting a bump to improve the heat exchange efficiency there. Instead, the height of the second pipe section 54 is increased so that when the magnetic powder is pressed, the height of the second pipe section 54 not only covers the height range of the magnetic powder, but also covers a certain height range of the top sleeve 30 and the upper mold at this time, thereby indirectly enhancing the heat exchange efficiency of the top sleeve 30 and the upper mold at this time to ensure that the pressing temperature of the magnetic powder is within a specific range.

[0050] Specifically, the magnetic core constant temperature pressing and molding equipment also includes a supply device for providing the thermally conductive medium to the infusion pipeline at a stable pressure. While the transfer of the thermally conductive medium within each delivery pipeline requires a supply device, this supply device can be a simple water pump, etc., ensuring that the introduced medium is transferred at a stable pressure, without requiring any other intelligent operation. This makes the supply device low-cost, highly interchangeable, and easy to maintain.

[0051] To sum up, the magnetic core constant temperature pressing and molding equipment in the above embodiment of the present invention forms a molding space by enclosing the inner wall of the avoidance groove 41 of the workbench 10, the top of the top sleeve 30 and the outer wall of the core 20, so that the magnetic powder is pressed and molded by the upper mold in the molding space, and by arranging an annular flange 31 and a spring 70 mounted on the top sleeve 30 at the lower end of the top sleeve 30, when the upper mold is pressed down and the force is large enough, the top sleeve 30 will also move downward. At the same time, the force of the spring 70 on the top sleeve 30 causes the magnetic powder to be subjected to pressing forces in both the upper and lower directions in the molding space, thereby improving the pressing and molding effect of the magnetic powder. In addition, since a conveying pipeline 50 for circulating a heat-conducting medium is provided in the lower mold 40, when the magnetic powder is pressed, the conveying pipeline 50 for circulating a heat-conducting medium ensures that the surrounding environment of the magnetic powder is at a specific temperature, thereby realizing the pressing of the magnetic powder by the temperature pressing technology. In addition, the input end of the transmission component 62 is connected to the annular flange 31, and the output end is connected to the regulating valve 61 provided on the liquid inlet pipe 51 of the delivery pipeline 50, so that when the top sleeve 30 moves downward under the action of the upper mold, the displacement will be transmitted to the regulating valve 61, and the regulating valve 61 is used to accelerate the flow rate of the heat-conducting medium in the delivery pipeline 50, thereby improving the heat conduction effect. Since the temperature of the mold will change dramatically during the pressing of the magnetic powder, the regulating valve 61 is provided in conjunction with the top sleeve 30, so that when the magnetic powder is pressed, the flow rate of the heat-conducting medium in the delivery pipeline 50 will be automatically adjusted, thereby achieving targeted The heat conduction effect is adjusted according to the working conditions, thereby ensuring that the temperature of the mold is always maintained within a preset range. When the pressing is continued for a period of time, after the pressing is completed, there is no longer severe extrusion friction between the upper mold, the top sleeve 30 and the magnetic powder, and thus no large amount of heat is generated. At this time, the upper mold moves upward under the action of an external force, and the top sleeve 30 is reset upward under the action of the spring 70, and continues to move upward under the action of the external force to push the pressed magnetic core out of the molding space, and then transmits the displacement to the regulating valve 61, so that the regulating valve 61 adjusts the flow rate in the conveying pipeline 50 to the initial heat preservation and energy-saving state again, thereby saving costs. Therefore, the magnetic core constant temperature pressing and molding equipment realizes the intelligent adjustment of the flow rate of the heat-conducting medium in the conveying pipeline 50 according to the different working conditions of the magnetic powder pressing through a simple mechanical structure design, so that the temperature of the mold is always maintained within a specific range. And because it is a purely mechanical structure and has a simple structure, its own cost is low, and the maintenance cost is low and the repair is simple. Furthermore, the present invention solves the problem in the prior art of the lack of a low-cost and simple-structured magnetic core constant temperature pressing and molding equipment.

[0052] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0053] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A magnetic core constant temperature pressing and molding device, characterized in that: The present invention comprises a workbench, a core arranged in a receiving groove of the workbench, a top sleeve sleeved on the outside of the core, and a lower mold sleeved on the outside of the top sleeve, wherein the lower mold is provided with an avoidance groove for accommodating the top sleeve, and the inner wall of the avoidance groove, the top of the top sleeve and the outer wall of the core enclose a molding space so that the magnetic powder is pressed and molded by the upper mold in the molding space; A delivery pipeline for circulating a heat-conducting medium is further provided in the lower mold, and a liquid inlet pipe and a liquid outlet pipe of the delivery pipeline pass through the workbench and are connected to a temperature regulating assembly provided on one side of the workbench; The accommodating groove is provided with a first step and a second step provided outside the first step, the first step is provided with a spring, the lower end of the top sleeve is provided with an annular flange, the spring is sleeved on the top sleeve with the top abutting against the bottom of the annular flange, and the bottom abutting against the first step; The temperature adjustment assembly includes a regulating valve provided on the liquid inlet pipe and a transmission component connected to the regulating valve, wherein the output end of the transmission component is connected to the regulating valve, and the input end is connected to the annular flange; When the upper die moves downward to compress the magnetic powder in the molding space, the lower die continues to move downward until the annular flange abuts against the second step. During this process, under the action of the spring, the upper die and the lower die simultaneously compress the magnetic powder, and the downward movement of the lower die transmits the displacement to the transmission component through the input end, so that the transmission component adjusts the regulating valve through the output end, thereby adjusting the flow rate of the heat-conducting medium in the delivery pipeline. The transmission component includes a first gear connected to the control shaft of the regulating valve, a worm arranged on one side of the first gear, and a rack arranged on one side of the worm. One end of the worm is adapted to the first gear, and the other end is provided with a second gear adapted to the rack. One side of the rack extends outward through the workbench and is connected to the annular flange, so that the rack moves up and down with the top sleeve.

2. The magnetic core constant temperature pressing and molding equipment according to claim 1, characterized in that: The conveying pipeline includes a first pipeline section, a second pipeline section and a third pipeline section which are distributed along the axis of the lower mold and surround the axis of the lower mold from top to bottom. The first pipeline section is connected to the liquid outlet pipe, and the third pipeline section is connected to the liquid inlet pipe. The pipeline diameter of the first pipeline section is consistent with the pipeline diameter of the third pipeline section, and the pipeline diameter of the second pipeline section is smaller than the pipeline diameter of the first pipeline section.

3. The magnetic core constant temperature pressing and molding equipment according to claim 2, characterized in that: The first pipeline segment, the second pipeline segment and the third pipeline segment have the same height, the spacing between adjacent pipelines in the first pipeline segment and the third pipeline segment is the same, and the spacing between adjacent pipelines in the second pipeline segment is smaller than the spacing between adjacent pipelines in the first pipeline segment.

4. The magnetic core constant temperature pressing and molding equipment according to claim 2, characterized in that: The pipelines of the first pipeline section and the third pipeline section are spirally arranged in the lower mold along the axis of the lower mold.

5. The magnetic core constant temperature pressing and molding equipment according to claim 2, characterized in that: The second pipeline segment includes multiple pipeline units, the number of which is an odd number. Any pipeline unit is composed of a pipeline that is serpentinely coiled from left to right along the axis of the lower mold. One end of the first and last pipeline units is respectively connected to the head end or tail end of the first pipeline segment and the third pipeline segment, and the two ends of any other pipeline unit are respectively connected to the head end or tail end of the adjacent pipeline unit.

6. The magnetic core constant temperature pressing and molding equipment according to claim 1, characterized in that: A first delivery pipe for delivering the heat-conducting medium is also provided on the inner side of the core. The liquid inlet pipe and the liquid outlet pipe of the first delivery pipe are arranged in a staggered double helix along the axis of the core, and the liquid inlet pipe and the liquid outlet pipe of the first delivery pipe are connected to each other near one end of the top of the core.

7. The magnetic core constant temperature pressing and molding equipment according to claim 6, characterized in that: A second delivery pipeline is provided in the top sleeve. One end of the liquid inlet pipe and the liquid outlet pipe of the second delivery pipeline are circumferentially arranged around the axis of the top sleeve and are connected to each other, and the other end is vertically arranged along the axis direction of the top sleeve.

8. The magnetic core constant temperature pressing and molding equipment according to claim 7, characterized in that: A convex block is provided in the first delivery pipe on one side close to the top of the core, and a convex block is also provided in the second delivery pipe on one side close to the top of the top sleeve.

9. The magnetic core constant temperature pressing and molding equipment according to claim 1, characterized in that: The magnetic core constant temperature pressing and molding equipment further includes a supply device for providing the heat conducting medium to the delivery pipeline at a stable pressure.

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