Ring ferrite forming die

Abstract

A ring ferrite forming die includes an upper die and a lower die; the lower die includes a die bottom plate, a punch, a die, a core, an upper top plate, a lower top plate, a die guide pin, a core guide pin, a stainless steel template, a bracket, and a stroke sensor; the stroke sensor is used to detect the distance moved by the output shaft of the drive unit or the lower top plate; an injection channel is provided in the stainless steel template, and a die injection hole connected to the injection channel is provided on the side wall of the die; an inner sealing ring is embedded on the inner side wall of the punch; a first outer sealing ring, a second outer sealing ring, and a third outer sealing ring are embedded on the outer side wall of the punch from top to bottom at intervals; when the die slides up and down, the die injection hole is always located above the third outer sealing ring. In this way, ring ferrites of different thickness specifications can be produced, the ring ferrite does not need to be moved during the demoulding process, the demoulding effect is good, the sealing ring is not easily damaged, the sealing effect is good, and the product quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of strong magnetic products, in particular to a ring-shaped ferrite forming die. Background Art

[0002] Induction cookers and other products contain a ring-shaped ferrite, which is formed into a blank by mixing a slurry of raw materials such as iron, manganese, zinc and water in a molding mold. After the blank is dried, it needs to be placed on a carrier plate, and then multiple carrier plates and blanks are sent to a tunnel kiln for sintering.

[0003] An existing molding mold can only mold products of one thickness specification, and cannot produce products of different thickness specifications. Existing molding molds are generally demolded by ejecting the product through a demolding unit. Since the newly molded product is not suitable for movement, the demolding effect is average. In addition, the sealing ring of the existing molding mold will pass through the injection port during the molding or demolding process. Once the sealing ring passes the injection port, the material may enter the gap between the movable part of the demolding unit and the fixed part of the mold at the injection port, thereby causing damage to the sealing ring, destroying the overall sealing, and reducing product quality. Summary of the invention

[0004] In view of this, the present invention provides an annular ferrite forming mold that can produce annular ferrites of different thickness specifications, the annular ferrite does not need to be moved during the demolding process, has a good demolding effect, the sealing ring is not easily damaged, has a good sealing effect and improves product quality, so as to solve the above problems.

[0005] A ring ferrite forming die, comprising an upper die and a lower die; the lower die comprises a die bottom plate, a punch disposed on the die bottom plate, a die movably located outside the punch, a core movably located in the middle of the punch, an upper top plate connected below the die and located above the die bottom plate, a lower top plate disposed below the die bottom plate, a plurality of die guide pins passing through the die bottom plate and connecting the upper top plate and the lower top plate, a core guide pin passing through the die bottom plate and connected between the core and the lower top plate, a stainless steel template disposed outside the die, a bracket disposed at the bottom of the die bottom plate, a driving unit for driving the lower top plate to move up and down, and at least one travel sensor; the punch The shape is cylindrical, and a core hole is opened in the middle along the axial direction, and the core guide column and the core are both slidably located in the core hole; the stroke sensor is used to detect the distance moved by the output shaft of the drive unit or the lower top plate; an injection channel is opened in the stainless steel template, and a die injection hole connected to the injection channel is opened on the side wall of the die, and the die injection hole can be movably connected to the molding cavity; an inner sealing ring is embedded on the inner side wall of the punch; a first outer sealing ring, a second outer sealing ring and a third outer sealing ring are embedded on the outer side wall of the punch at intervals from top to bottom; when the die slides up and down, the die injection hole is always located above the third outer sealing ring.

[0006] Furthermore, the bottom of the punch is connected to the die bottom plate via a punch bottom plate.

[0007] Furthermore, the plurality of travel sensors are installed on the bracket at intervals up and down, and are used to sense the position of the lower top plate.

[0008] Furthermore, the height of the second outer sealing ring is greater than the heights of the first outer sealing ring and the third outer sealing ring.

[0009] Furthermore, the first outer sealing ring and the third outer sealing ring have the same height, and the height of the second outer sealing ring is twice the height of the first outer sealing ring and the third outer sealing ring.

[0010] Furthermore, the injection hole of the female mold is connected to a feeding unit through a feeding valve.

[0011] Furthermore, the driving unit, the feeding valve and the stroke sensor are all connected to a controller.

[0012] Furthermore, the molding cavity is also provided with a vacuum port and an overflow port.

[0013] Furthermore, when the upper die completes pressing of the material in the molding cavity, the injection hole of the concave die is located between the first outer sealing ring and the third outer sealing ring.

[0014] Furthermore, when the upper die completes pressing of the material in the molding cavity, the injection hole of the concave die is opposite to the second outer sealing ring.

[0015] Compared with the prior art, the annular ferrite forming mold of the present invention comprises an upper mold and a lower mold; the lower mold comprises a mold base plate, a punch arranged on the mold base plate, a die movably located outside the punch, a core movably located in the middle of the punch, an upper top plate connected below the die and located above the mold base plate, a lower top plate arranged below the mold base plate, a plurality of die guide pins passing through the mold base plate and connecting the upper top plate and the lower top plate, a core guide pin passing through the mold base plate and connected between the core and the lower top plate, a stainless steel template arranged outside the die, a bracket arranged at the bottom of the mold base plate, a driving unit for driving the lower top plate to move up and down, and at least one travel sensor. The punch is cylindrical, and a core hole is opened in the middle along the axial direction. The core guide column and the core are both slidably located in the core hole. The stroke sensor is used to detect the distance moved by the output shaft of the drive unit or the lower top plate. The stainless steel template is provided with an injection channel, and the side wall of the die is provided with a die injection hole connected to the injection channel. The die injection hole can be movably connected to the molding cavity. An inner sealing ring is embedded on the inner side wall of the punch. The first outer sealing ring, the second outer sealing ring and the third outer sealing ring are embedded on the outer side wall of the punch from top to bottom. When the die slides up and down, the die injection hole is always located above the third outer sealing ring. In this way, annular ferrites of different thickness specifications can be produced, the annular ferrite does not need to be moved during the demoulding process, the demoulding effect is good, the sealing ring is not easy to be damaged, the sealing effect is good, and the product quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The embodiments of the present invention are described below in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 A side schematic diagram of the annular ferrite forming die provided by the present invention.

[0018] Figure 2 for Figure 1 An enlarged schematic diagram of part A in FIG.

[0019] Figure 3 for Figure 1 Schematic diagram of the top view of the lower mold in.

[0020] Figure 4 This is a schematic diagram of another state of the annular ferrite forming mold provided by the present invention.

[0021] Figure 5 for Figure 1 Schematic diagram of the demoulding state of the lower mold in . DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are further described in detail below based on the accompanying drawings. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0023] Please refer to Figure 1The annular ferrite forming mold provided by the present invention includes an upper mold 10 and a lower mold 20.

[0024] The upper die 10 is driven by a hydraulic drive unit to move up and down.

[0025] The lower mold 20 includes a mold base plate 21, a punch 22 arranged on the mold base plate 21, a die 23 movably located on the outside of the punch 22, a core 24 movably located in the middle of the punch 22, an upper top plate 252 connected to the bottom of the die 23 and located above the mold base plate 21, a lower top plate 251 arranged below the mold base plate 21, a plurality of die guide pillars 25 passing through the mold base plate 21 and connecting the upper top plate 252 and the lower top plate 251, a core guide pillar 241 passing through the mold base plate 21 and connected between the core 24 and the lower top plate 251, a stainless steel template 26 arranged on the outside of the die 23, a bracket 27 arranged at the bottom of the mold base plate 21, a driving unit for driving the lower top plate 251 to move up and down, a plurality of sealing rings and at least one stroke sensor 29.

[0026] The mold bottom plate 21 is provided with a plurality of first through holes corresponding to the plurality of die guide pillars 25 , and a second through hole corresponding to the core guide pillars 241 . The die guide pillars 25 pass through the first through holes, and the core guide pillars 241 pass through the second through holes.

[0027] The shape of the punch 22 is cylindrical, and a core hole is opened in the middle along the axial direction. The core guide column 241 and the core 24 are both slidably located in the core hole.

[0028] The bottom of the punch 22 is connected to the die bottom plate 21 through a punch bottom plate 221. The punch bottom plate 221 is used to ensure the consistency of the heights of the multiple punches 22.

[0029] The punch 22, the die 23, the core 24 and the upper die 10 form a molding cavity.

[0030] When the driving unit drives the lower top plate 251, the die guide pillar 25 and the core guide pillar 241 to move up and down, the upper top plate 252, the die 23, the stainless steel template 26 and the core 24 are driven to slide up and down together.

[0031] The lower top plate 251 and the upper top plate 252 ensure the consistency of the heights of the plurality of concave dies 23 .

[0032] The travel sensor 29 is used to detect the distance moved by the output shaft of the driving unit or the lower top plate 251. In this embodiment, a plurality of travel sensors 29 are installed on the bracket 27 at intervals in the upper and lower parts to sense the position of the lower top plate 251.

[0033] Please refer to Figure 2The stainless steel template 26 is provided with an injection channel 261, and the side wall of the die 23 is provided with a die injection hole 231 connected to the injection channel 261. The die injection hole 231 is connected to a feeding unit through a feeding valve. When the die 23 slides up and down, the die injection hole 231 can be movably connected to the molding cavity.

[0034] Two inner sealing rings 281 are embedded at intervals on the inner side wall of the punch 22 to achieve sealing between the core 24 and the punch 22 when the core 24 slides relative to the punch 22 .

[0035] A first outer sealing ring 282 , a second outer sealing ring 283 and a third outer sealing ring 284 are embedded on the outer side wall of the punch 22 at intervals from top to bottom, so as to realize multi-stage sealing in the bracket of the die 23 and the punch 22 when the die 23 slides relative to the punch 22 .

[0036] In this embodiment, the height of the second outer sealing ring 283 between the first outer sealing ring 282 and the third outer sealing ring 284 is greater than the heights of the first outer sealing ring 282 and the third outer sealing ring 284. Preferably, the heights of the first outer sealing ring 282 and the third outer sealing ring 284 are the same, and the height of the second outer sealing ring 283 is twice the height of the first outer sealing ring 282 and the third outer sealing ring 284.

[0037] The drive unit, the feed valve and the travel sensor 29 are all connected to a controller.

[0038] Please refer to Figure 3 In order to realize the production of multiple products at the same time, the lower mold 20 is provided with six punches 22, six concave molds 23, and six cores 24 on the stainless steel template 26, that is, it has six molding cavities and can produce six annular ferrites at the same time.

[0039] The molding cavity is also provided with a vacuum port and an overflow port. The vacuum port is connected to a vacuum pump for vacuuming the molding cavity and discharging moisture, and the overflow port is used to remove excess material during the pressing process.

[0040] Please refer again Figure 1 When preparing annular ferrite, first, the driving unit drives the die 23 and the core 24 to move upward by a preset first distance, so that the die injection hole 231 is located above the top of the punch 22 and is connected to the molding cavity, as shown by arrow a; then the hydraulic driving unit drives the upper mold 10 to move downward by a certain distance, so that the upper mold 10 is in contact with the die 23 and the core 24, so that the upper opening of the molding cavity is closed, as shown by arrow b; then the feeding unit, the feeding valve, the injection channel 261 and the die injection hole 231 are used to inject material into the molding cavity, as shown by arrow c.

[0041] The first distance that the die 23 and the core 24 move upward determines the size of the molding cavity, and the controller controls the stroke of the driving unit through the stroke sensor 29, thereby controlling the first distance. The size of the molding cavity determines the amount of material injected into the molding cavity, so that the thickness of the annular ferrite 100 formed after the subsequent pressing of the upper mold 10 is different.

[0042] Afterwards, the hydraulic drive unit drives the upper mold 10 to move downward, and drives the female mold 23 and the core 24 to move downward together, thereby pressing the material in the molding cavity, as shown by arrow d.

[0043] Please refer to Figure 4 The hydraulic drive unit presses the material at a predetermined pressure for a certain period of time and then moves upward, thereby separating from the annular ferrite 100 formed by the material. After the pressing is completed, the die injection hole 231 is located between the first outer sealing ring 282 and the third outer sealing ring 284. Preferably, the die injection hole 231 is opposite to the second outer sealing ring 283. In this way, the material, water or air in the molding cavity and the die injection hole 231 will not enter the gap between the male mold 22 and the female mold 23 below the third outer sealing ring 284, thereby improving the sealing performance.

[0044] Please refer to Figure 5 After that, the driving unit drives the die 23 and the core 24 to move downward by a preset second distance, so that the die 23 and the core 24 are separated from the annular ferrite 100, as shown by arrow e. At this time, the die injection hole 231 is located between the second outer sealing ring 283 and the third outer sealing ring 284, so that the material, water or air in the die injection hole 231 will never enter the gap between the punch 22 and the die 23 below the third outer sealing ring 284, thereby improving the sealing performance. During the entire pressing process, the first outer sealing ring 282, the second outer sealing ring 283 and the third outer sealing ring 284 are not easily damaged, thereby improving the service life.

[0045] Compared with the prior art, the annular ferrite forming mold of the present invention comprises an upper mold 10 and a lower mold 20; the lower mold 20 comprises a mold base plate 21, a punch 22 arranged on the mold base plate 21, a die 23 movably located outside the punch 22, a core 24 movably located in the middle of the punch 22, an upper top plate 252 connected below the die 23 and located above the mold base plate 21, a lower top plate 251 arranged below the mold base plate 21, a plurality of die guide pins 25 passing through the mold base plate 21 and connecting the upper top plate 252 and the lower top plate 251, a core guide pin 241 passing through the mold base plate 21 and connected between the core 24 and the lower top plate 251, a stainless steel template 26 arranged outside the die 23, a bracket 27 arranged at the bottom of the mold base plate 21, a driving unit for driving the lower top plate 251 to move up and down, a plurality of sealing rings and at least one The punch 22 is cylindrical in shape, and a core hole is axially provided in the middle, and the core guide column 241 and the core 24 are both slidably located in the core hole; the stroke sensor 29 is used to detect the moving distance of the output shaft of the drive unit or the lower top plate 251; an injection channel 261 is provided in the stainless steel template 26, and a die injection hole 231 connected to the injection channel 261 is provided on the side wall of the die 23, and the die injection hole 231 is movably connected to the molding cavity; two inner sealing rings 281 are embedded at intervals on the inner wall of the punch 22; a first outer sealing ring 282, a second outer sealing ring 283 and a third outer sealing ring 284 are embedded at intervals from top to bottom on the outer wall of the punch 22; when the die 23 slides up and down, the die injection hole 231 is always located above the third outer sealing ring 284. In this way, annular ferrites with different thickness specifications can be produced, the annular ferrite does not need to be moved during the demoulding process, the demoulding effect is good, the sealing ring is not easily damaged, the sealing effect is good and the product quality is improved.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention is included in the scope of the claims of the present invention.

Claims

1. A ring ferrite forming die, characterized in that: The invention comprises an upper die and a lower die; the lower die comprises a die bottom plate, a punch arranged on the die bottom plate, a die movably located outside the punch, a core movably located in the middle of the punch, an upper top plate connected to the bottom of the die and located above the die bottom plate, a lower top plate arranged below the die bottom plate, a plurality of die guide pins passing through the die bottom plate and connecting the upper top plate and the lower top plate, a core guide pin passing through the die bottom plate and connected between the core and the lower top plate, a stainless steel template arranged outside the die, a bracket arranged at the bottom of the die bottom plate, a driving unit for driving the lower top plate to move up and down, and at least one stroke sensor; the shape of the punch is cylindrical, and a core hole is opened in the middle along the axial direction, and the core guide pin and the core are both slidably located in the core hole; the stroke sensor is used to detect the output shaft of the driving unit or the moving distance of the lower top plate; an injection channel is opened in the stainless steel template, and a die injection hole connected to the injection channel is opened on the side wall of the die The material hole of the die is movably connected with the molding cavity; an inner sealing ring is embedded on the inner side wall of the punch; a first outer sealing ring, a second outer sealing ring and a third outer sealing ring are embedded on the outer side wall of the punch at intervals from top to bottom; when the die slides up and down, the die injection hole is always located above the third outer sealing ring, when feeding, the die injection hole is located above the first outer sealing ring, when the upper die completes pressing the material in the molding cavity, the die injection hole is located between the first outer sealing ring and the third outer sealing ring, the die injection hole is opposite to the second outer sealing ring, the driving unit drives the die and the core to move downward by a preset second distance, so that the die and the core are separated from the annular ferrite, at this time, the die injection hole is located between the second outer sealing ring and the third outer sealing ring, so that the material, water or air in the die injection hole will never enter the gap between the punch and the die below the third outer sealing ring.

2. The annular ferrite forming die according to claim 1, characterized in that: The bottom of the punch is connected to the die bottom plate via a punch bottom plate.

3. The annular ferrite forming die according to claim 1, characterized in that: The plurality of travel sensors are installed on the bracket at intervals up and down, and are used for sensing the position of the lower top plate.

4. The annular ferrite forming die according to claim 1, characterized in that: The height of the second outer sealing ring is greater than that of the first outer sealing ring and the third outer sealing ring.

5. The annular ferrite forming die according to claim 4, characterized in that: The first outer sealing ring and the third outer sealing ring have the same height, and the height of the second outer sealing ring is twice the height of the first outer sealing ring and the third outer sealing ring.

6. The annular ferrite forming die according to claim 1, characterized in that: The injection hole of the concave mold is connected with a feeding unit through a feeding valve.

7. The annular ferrite forming die according to claim 6, characterized in that: The driving unit, the feeding valve and the stroke sensor are all connected to a controller.

8. The annular ferrite forming die according to claim 1, characterized in that: The molding cavity is also provided with a vacuum port and an overflow port.

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