A bubble-proof soft ferrite core mold

Abstract

The present invention relates to the field of molds, and specifically discloses a bubble-proof soft magnetic ferrite core mold, including a top mold base and a bottom mold base arranged in parallel, a mold core assembly is arranged between the top mold base and the bottom mold base, and guide column units are arranged at the four corners of the top mold base and the bottom mold base, and the top mold base moves along the axial direction of the guide column unit, so that the spacing between the opposite sides of the top mold base and the bottom mold base changes. The present invention is provided with a two-stage insertable vibration unit, which can be slowly inserted into the material through vibration, and through a structure similar to a tuning fork, a small ball collision vibration is used to guide the vibration to the internal material, thereby ensuring the density of the material, and after the material is dense, the material filling can be detected by inserting the rod body position. During the subsequent pressing, no bubbles will remain inside, thereby ensuring the molding effect of the ferrite.

Description

Technical Field

[0001] The invention relates to the field of moulds, and more particularly to a bubble-proof soft ferrite core mould. Background Art

[0002] Soft ferrite cores are materials that are easily magnetized and demagnetized, and are primarily used to enhance or direct the magnetic flux generated by an electric current. Soft ferrite cores are widely used in power electronic circuits, such as voltage and current transformers, saturable reactors, magnetic amplifiers, inductors, chokes, etc. These magnetic devices may need to operate at frequencies as low as 50 / 60 Hz or as low as DC or above 1 MHz.

[0003] Ferrite refers to a "functional ceramic material" made by sintering iron oxide and other metal oxides. Many existing ferrites cannot be compacted during preparation, resulting in residual bubbles inside, resulting in bubble holes on the surface during compaction, affecting winding and magnetic flux distribution. Summary of the invention

[0004] The invention provides a bubble-proof soft ferrite core mold, which solves the technical problem of internal residual bubbles in the related art.

[0005] According to one aspect of the present invention, there is provided a bubble-proof soft ferrite core mold, comprising a top mold base and a bottom mold base arranged in parallel, a mold core assembly is arranged between the top mold base and the bottom mold base, guide column units are arranged at the four corners of the top mold base and the bottom mold base, and the top mold base moves along the axial direction of the guide column unit, so that the distance between the opposite sides of the top mold base and the bottom mold base changes;

[0006] A vibration unit is inserted into the top of the core assembly, and the bottom end of the vibration unit extends to the connection interface between the upper core and the middle core. The vibration unit includes a casting bucket, an extrusion rod, a vibration fork, an insertion rod and a vibration ball. The casting bucket is connected to the outer wall of the insertion rod, and the extrusion rod is inserted into the inside of the insertion rod. The vibration fork is arranged at the end of the extrusion rod, and the bottom end of the vibration ball is connected to a connecting rod. The bottom end of the connecting rod is connected to the end of the extrusion rod. The connecting rod is an elastic rod. The bottom end of the extrusion rod is annularly provided with exhaust holes, and the exhaust holes are used to discharge gas in the soft ferrite core material.

[0007] Furthermore: the vibration fork is a "U"-shaped structure, and the vibration fork is made of carbon steel, aluminum-magnesium alloy and fused quartz.

[0008] Furthermore: the vibration ball and the vibration fork are made of the same material, and the outer wall of the vibration ball is provided with a rubber layer.

[0009] Furthermore: the mold core assembly includes an upper mold core, a middle mold core and a bottom mold core, the upper mold core passes through the middle mold core and is pressed onto the outer wall of the bottom mold core, and a casting cavity is left between the bottom end of the upper mold core and the inner wall of the bottom mold core.

[0010] Furthermore: a tray is provided above the bottom mold base, a placement groove is provided on the top of the tray, and the placement groove is used to install the mold core assembly.

[0011] Furthermore: positioning rods are installed at the four corners of the top of the core assembly, and the positioning rods are slidably connected to the inner wall of the top mold base.

[0012] Further: the guide column unit includes an upper sleeve, a lower sleeve and a sliding guide column, the upper sleeve is installed on the inner side of the top mold base, the lower sleeve is installed on the inner side of the bottom mold base, the bottom end of the sliding guide column is inserted into the interior of the lower sleeve, and the upper sleeve is slidably connected to the outer wall of the sliding guide column.

[0013] Furthermore: a connecting rod and a spring are provided between the bottom mold core and the middle mold core, the spring is sleeved on the outer wall of the connecting rod, and the spring is supported between the inner walls of the opposite sides of the bottom mold core and the middle mold core.

[0014] Furthermore: a fixing screw is inserted into the inner wall of the bottom mold base, and a screw sleeve is inserted into the top of the top mold base, and the bottom of the screw sleeve is connected to the end of the fixing screw through a thread.

[0015] The beneficial effects of the present invention are:

[0016] The mold is provided with a two-stage insertable vibration unit, which can be slowly inserted into the material through vibration, and through a structure similar to a tuning fork, the vibration of the small ball is utilized to guide the vibration into the internal material, thereby ensuring the density of the material. After the material is dense, the position of the inserted rod can be used to detect whether the material is filled fully. During the subsequent pressing, no bubbles will remain inside, thereby ensuring the molding effect of the ferrite. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an assembly diagram of an anti-bubble soft ferrite core mold proposed by the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the assembly structure;

[0019] Figure 3 It is a schematic diagram of inserting a vibration unit of a bubble-proof soft ferrite core mold proposed by the present invention;

[0020] Figure 4 It is a schematic diagram of the main structural view of the vibration unit installation of a bubble-proof soft ferrite core mold proposed by the present invention;

[0021] Figure 5 The present invention is a schematic diagram of a vibration unit structure of a bubble-proof soft ferrite core mold.

[0022] In the figure: 100, top mold base; 200, guide column unit; 210, upper shaft sleeve; 220, sliding guide column; 230, lower shaft sleeve; 300, positioning rod; 400, upper mold core; 500, middle mold core; 600, bottom mold core; 700, tray; 800, bottom mold base; 900, vibration unit; 910, casting bucket; 920, extrusion rod; 930, exhaust hole; 940, vibration fork; 950, insertion rod; 960, vibration ball. DETAILED DESCRIPTION

[0023] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and is not a limitation of the scope of protection, applicability or examples set forth in the claims. The functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0024] Embodiment 1

[0025] See also Figure 1-Figure 5 As shown, a bubble-proof soft ferrite core mold comprises a top mold base 100 and a bottom mold base 800 arranged in parallel, a mold core assembly is arranged between the top mold base 100 and the bottom mold base 800, guide column units 200 are arranged at the four corners of the top mold base 100 and the bottom mold base 800, and the top mold base 100 moves along the axial direction of the guide column unit 200, so that the distance between the opposite sides of the top mold base 100 and the bottom mold base 800 changes;

[0026] A vibration unit 900 is inserted into the top of the core assembly, and the bottom end of the vibration unit 900 extends to the connection interface between the upper core 400 and the middle core 500. The vibration unit 900 includes a casting bucket 910, an extrusion rod 920, a vibration fork 940, an insertion rod 950 and a vibration ball 960. The casting bucket 910 is connected to the outer wall of the insertion rod 950, and the extrusion rod 920 is inserted into the interior of the insertion rod 950. The vibration fork 940 is arranged at the end of the extrusion rod 920, and the bottom end of the vibration ball 960 is connected to a connecting rod, and the bottom end of the connecting rod is connected to the end of the extrusion rod 920. The connecting rod is an elastic rod, and the bottom end of the extrusion rod 920 is annularly distributed with exhaust holes 930, and the exhaust holes 930 are used to discharge gas in the soft ferrite core material.

[0027] The vibration fork 940 is a "U"-shaped structure, and the vibration fork 940 is made of carbon steel, aluminum-magnesium alloy and fused quartz.

[0028] The vibration ball 960 and the vibration fork 940 are made of the same material, and a rubber layer is disposed on the outer wall of the vibration ball 960 .

[0029] The mold core assembly includes an upper mold core 400 , a middle mold core 500 and a bottom mold core 600 . The upper mold core 400 passes through the middle mold core 500 and is pressed onto the outer wall of the bottom mold core 600 . A casting cavity is left between the bottom end of the upper mold core 400 and the inner wall of the bottom mold core 600 .

[0030] A tray 700 is disposed above the bottom mold base 800 , and a placement groove is disposed on the top of the tray 700 , and the placement groove is used to install the mold core assembly.

[0031] Positioning rods 300 are installed at the four corners of the top of the mold core assembly, and the positioning rods 300 are slidably connected to the inner wall of the top mold base 100.

[0032] The guide column unit 200 includes an upper sleeve 210, a lower sleeve 230 and a sliding guide column 220. The upper sleeve 210 is installed on the inner side of the top mold base 100, the lower sleeve 230 is installed on the inner side of the bottom mold base 800, the bottom end of the sliding guide column 220 is inserted into the interior of the lower sleeve 230, and the upper sleeve 210 is slidably connected to the outer wall of the sliding guide column 220.

[0033] A connecting rod and a spring are provided between the bottom mold core 600 and the middle mold core 500 . The spring is sleeved on the outer wall of the connecting rod, and the spring is supported between the inner walls of the opposite sides of the bottom mold core 600 and the middle mold core 500 .

[0034] A fixing screw is inserted into the inner wall of the bottom mold base 800, and a screw sleeve is inserted into the top of the top mold base 100, and the bottom of the screw sleeve is connected to the end of the fixing screw through a thread.

[0035] The magnetic core mold is used to form a soft ferrite magnetic core. The soft ferrite is a ferromagnetic oxide with Fe2O3 as the main component. It is produced by a powder metallurgy method, first pressed and then fired. Specifically, the existing molding mold is made by mixing the raw materials of the soft ferrite magnetic core with a binder to form a fluid state, and then pouring it through the pouring bucket 910 on the top. At this time, it is dense after pouring, and is pressed down into the pouring bucket 910 by the extrusion rod 920. The bottom tip of the extrusion rod 920 abuts against the connection interface between the upper mold core 400 and the middle mold core 500. By pulling the vibration ball 960 on the connecting rod, the vibration ball 960 swings to the middle of the vibration fork 940 under the recovery action of the connecting rod, and impacts the vibration fork 940. The vibration fork 940 causes vibration, and the vibration is transmitted to the bottom end of the extrusion rod 920 through the insertion rod 950. The rod end vibrates and compacts the raw materials, so that the gaps and bubbles therein are vibrated out, and the gas is discharged through the exhaust hole 930. During vibration, the filling is refilled and dense, so that the extrusion rod 920 cannot be inserted into the interior;

[0036] The guide column unit 200 is used to guide the upper and lower top mold base 100 and bottom mold base 800 to be pressed together, so that the cavities inside them are pressed together, that is, the top mold base 100 moves along the sliding guide column 220 to reduce the gap in the core assembly to a minimum. Finally, by removing the positioning rod 300 and the bottom bolt, the core assembly can be taken out in half, so that the dense soft ferrite core inside can be taken out and sintered to form.

[0037] The embodiment of the present embodiment is described above in conjunction with the accompanying drawings, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present embodiment, ordinary technicians in this field can also make many forms without departing from the purpose of the present embodiment and the scope of protection of the claims, all of which are within the protection of the present embodiment.

Claims

1. A bubble-proof soft ferrite core mold, comprising a top mold base (100) and a bottom mold base (800) arranged in parallel, characterized in that: A mold core assembly is provided between the top mold base (100) and the bottom mold base (800), and guide column units (200) are provided at the four corners of the top mold base (100) and the bottom mold base (800). The top mold base (100) moves along the axial direction of the guide column unit (200), so that the distance between the opposite sides of the top mold base (100) and the bottom mold base (800) changes; A vibration unit (900) is inserted into the top of the core assembly, and the bottom end of the vibration unit (900) extends to the connection interface between the upper core (400) and the middle core (500). The vibration unit (900) comprises a casting bucket (910), an extrusion rod (920), a vibration fork (940), an insertion rod (950) and a vibration ball (960). The casting bucket (910) is connected to the outer wall of the insertion rod (950), and the extrusion rod (920) is inserted into the inside of the insertion rod (950). The vibration fork (940) is arranged at the end of the extrusion rod (920), and the bottom end of the vibration ball (960) is connected to a connecting rod, and the bottom end of the connecting rod is connected to the end of the extrusion rod (920). The connecting rod is an elastic rod. The bottom end of the extrusion rod (920) is annularly provided with exhaust holes (930), and the exhaust holes (930) are used to discharge gas in the soft ferrite core material.

2. The anti-bubble soft ferrite core mold according to claim 1, characterized in that: The vibration fork (940) is a "U"-shaped structure, and the vibration fork (940) is made of carbon steel, aluminum-magnesium alloy and fused quartz.

3. The anti-bubble soft ferrite core mold according to claim 2, characterized in that: The vibration ball (960) and the vibration fork (940) are made of the same material, and the outer wall of the vibration ball (960) is provided with a rubber layer.

4. The anti-bubble soft ferrite core mold according to claim 1, characterized in that: The mold core assembly comprises an upper mold core (400), a middle mold core (500) and a bottom mold core (600); the upper mold core (400) passes through the middle mold core (500) and is pressed onto the outer wall of the bottom mold core (600); a casting cavity is left between the bottom end of the upper mold core (400) and the inner wall of the bottom mold core (600).

5. The anti-bubble soft ferrite core mold according to claim 4, characterized in that: A tray (700) is provided above the bottom mold base (800), and a placement groove is provided on the top of the tray (700), and the placement groove is used to install the mold core assembly.

6. The anti-bubble soft ferrite core mold according to claim 4, characterized in that: Positioning rods (300) are installed at the four corners of the top of the core assembly, and the positioning rods (300) are slidably connected to the inner wall of the top mold base (100).

7. The anti-bubble soft ferrite core mold according to claim 1, characterized in that: The guide column unit (200) comprises an upper sleeve (210), a lower sleeve (230) and a sliding guide column (220), wherein the upper sleeve (210) is installed on the inner side of the top mold base (100), the lower sleeve (230) is installed on the inner side of the bottom mold base (800), the bottom end of the sliding guide column (220) is inserted into the interior of the lower sleeve (230), and the upper sleeve (210) is slidably connected to the outer wall of the sliding guide column (220).

8. The anti-bubble soft ferrite core mold according to claim 4, characterized in that: A connecting rod and a spring are provided between the bottom mold core (600) and the middle mold core (500). The spring is sleeved on the outer wall of the connecting rod and supported between the inner walls of the opposite sides of the bottom mold core (600) and the middle mold core (500).

9. The anti-bubble soft ferrite core mold according to claim 8, characterized in that: A fixing screw is inserted into the inner wall of the bottom mold base (800), and a screw sleeve is inserted into the top of the top mold base (100), and the bottom of the screw sleeve is connected to the end of the fixing screw through a thread.

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