Coil orientation forming die

Abstract

The utility model discloses a coil orientation forming die which comprises a forming cavity used for forming a magnetic sheet, the forming cavity is formed by splicing an upper die base and a lower die base, an upper die coil is wound on the upper die base in the circumferential direction, a lower die coil is wound on the lower die base in the circumferential direction, and the winding direction of the upper die coil is the same as that of the lower die coil. An ejector pin is movably connected into the lower die base, the end face, close to the upper die base, of the ejector pin is used for being spliced into the lower end face of the forming cavity, the ejector pin is made of magnetic steel, and the upper die base and the lower die base are made of non-magnetic steel. The coil orientation forming die provided by the utility model ensures the parallelism of an orientation magnetic field and is low in cost.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to a coil orientation molding mold. Background Art

[0002] When producing magnetic sheets by injection molding magnetic particles, in order to make the molded magnetic sheets have a higher magnetic field strength, the injection molded magnetic particles will be magnetically guided before the magnetic sheets are formed, so that the injection molded magnetic particles have a consistent magnetic field orientation, and then the molded magnets will be magnetized with the corresponding magnetic field orientation, so that the molded magnets have a higher magnetic field strength.

[0003] In order to ensure the accuracy of the magnetic field direction after the magnetic sheet is oriented, the traditional orientation molding mold will place magnetic poles that are much larger than the molding cavity area on both sides of the magnetic field direction of the molding cavity to form an orientation magnetic field, thereby ensuring the parallelism and uniformity of the magnetic field direction formed on the molding cavity. However, this orientation structure makes the orientation mold bulky, and the magnetic poles used for orientation are generally made of neodymium iron boron material, which is a rare earth material and has high cost. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a coil orientation forming die which ensures the parallelism of the orientation magnetic field and has low cost.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problem is: a coil orientation molding die, comprising a molding cavity for molding a magnetic sheet, the molding cavity is formed by splicing an upper mold base and a lower mold base, an upper mold coil is wound around the circumference of the upper mold base, and a lower mold coil is wound around the circumference of the lower mold base, the winding directions of the upper mold coil and the lower mold coil are the same, a ejector pin is movably connected in the lower mold base, the end face of the ejector pin close to the upper mold base is used for splicing into the lower end face of the molding cavity, the ejector pin is made of magnetic steel, and the upper mold base and the lower mold base are made of non-magnetic steel.

[0006] Compared with the prior art, the utility model has the advantages that: the upper mold coil will form an axially parallel magnetic field in the inner circle of the upper mold coil after being energized, and the lower mold coil will form another axially parallel magnetic field in the inner circle of the lower mold coil after being energized. By setting the molding cavity between the upper mold coil and the lower mold coil, it is equivalent to setting the molding cavity in a parallel magnetic field. When the energization direction of the upper mold coil is the same as that of the lower mold coil, a stronger magnetic field can be formed on the molding cavity, and the parallelism of the magnetic field lines can be guaranteed, thereby ensuring the parallelism of the orientation magnetic field of the magnetic sheet formed in the molding cavity. Moreover, the upper mold coil and the lower mold coil are formed by winding copper wire, which costs much less than neodymium iron boron material, and the upper mold coil and the lower mold coil can adjust the magnetic field strength of the orientation magnetic field by changing the size of the current, which can better control the orientation magnetic field strength of the magnetic sheet after molding, and contribute to the high-quality molding of the magnetic sheet; the upper mold base and the lower mold base are made of non-magnetic steel, and only the ejector pin is made of magnetic steel, which can make the magnetic field formed inside the lower mold coil converge on the ejector pin to enhance the magnetic field strength on the ejector pin, thereby enhancing the orientation strength of the magnetic sheet in the molding cavity and improving the orientation efficiency.

[0007] As an improvement of the utility model, during molding, the upper mold base and the lower mold base are abutted against each other, a gap is provided between the upper mold coil and the lower mold coil, and the molding cavity is provided in the gap between the upper mold coil and the lower mold coil. Through the improvement, during molding, the design of the upper mold base and the lower mold base abutting against each other is to ensure the molding quality of the magnetic sheet, and the design of the gap between the upper mold coil and the lower mold coil is to increase the diversity of the magnetic field formed by the orientation of the magnetic sheet. If the upper mold coil and the lower mold coil are also designed to abut against each other, the upper mold coil and the lower mold coil will only form two situations of superposition or mutual cancellation. However, through the design of the gap and the molding cavity being provided in the gap, a mutually repelling magnetic field can be formed between the upper mold coil and the lower mold coil, thereby forming a radially oriented magnetic field on the molding cavity.

[0008] As an improvement of the utility model, the outer ring of the upper mold coil is provided with an upper molding frame for molding the upper mold coil, and the outer ring of the lower mold coil is provided with a lower molding frame for molding the lower mold coil. The upper molding frame and the lower molding frame arranged on the same side are staggered. Through the improvement, the upper mold coil is molded by the upper molding frame, and the lower mold coil is molded by the lower molding frame, so as to ensure the gap between the upper mold coil and the lower mold coil when the mold is closed, and ensure the molding quality of the magnetic sheet when forming a magnetic sheet with a radially oriented magnetic field; and the staggered setting of the upper molding frame and the lower molding frame is to avoid interference between the two when the mold is closed.

[0009] As an improvement of the present invention, a plurality of alignment holes are provided on the circumference of the upper die base, and a plurality of alignment columns corresponding to the alignment holes are provided on the circumference of the lower die base. Through the improvement, the accuracy of the movement and alignment between the upper die base and the lower die base is ensured, and the offset between the upper die base and the lower die base after multiple mold splitting is avoided.

[0010] As an improvement of the utility model, the upper mold base is provided with an injection channel for injecting injection molding magnetic particles into the molding cavity. The molding cavities are provided with a total of multiple, and the multiple molding cavities are evenly distributed in an array along the circumference of the injection channel. Through the improvement, multiple magnetic sheets can be molded at the same time, thereby improving production efficiency. The design of the multiple molding cavities being evenly distributed in an array along the circumference of the injection channel can ensure that the molding pressure of each molding cavity is the same, thereby ensuring the consistency of the molding quality.

[0011] As an improvement of the utility model, the upper die base is provided with an upper die cavity base for molding the upper end of the molding cavity, and the upper die cavity base is detachably connected to the upper die base; the lower die base is provided with a lower die cavity base for molding the lower end of the molding cavity, and the lower die cavity base is detachably connected to the lower die base; the ejector pin is detachably connected to the ejector pin base, and the ejector pin base is movably connected to the side of the lower die base away from the upper die base along the axial direction of the ejector pin. Through the improvement, the production of magnetic sheets of different specifications and shapes can be switched by replacing the upper die cavity base, the lower die cavity base and the ejector pin.

[0012] As an improvement of the utility model, upper disassembly holes are provided on the four corners of the upper die seat, and lower disassembly holes are provided on the four corners of the lower die seat. Through the improvement, it is easy to disassemble the upper die cavity seat and the lower die cavity seat to quickly adjust and process different magnetic sheets.

[0013] As an improvement of the utility model, a water cooling channel is further provided on the circumference of the lower mold cavity seat, and the water cooling channel is used to install a water cooling pipe for controlling the mold temperature of the molding cavity. Through the improvement, it is convenient to cool and shape the molding cavity, shorten the shaping time of the molding cavity, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model when the whole mold is split.

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model when the whole mold is split.

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the connection between the upper die base and the lower die base when the utility model is integrally molded.

[0017] Figure 4 It is a schematic diagram of the structure of the upper die seat of the utility model.

[0018] Figure 5 It is a schematic diagram of the structure of the lower die base of the utility model.

[0019] Figure 6 It is a schematic diagram of the structure of the utility model after the integral injection molding magnetic particle material is finalized.

[0020] Figure 7 It is a schematic diagram of the water-cooling flow channel structure of the utility model.

[0021] Figure 8 It is a schematic diagram of the magnetic pole structure after molding of the magnetic sheet embodiment 1 of the utility model.

[0022] Fig. 9 It is a schematic diagram of the magnetic pole structure after molding of the magnetic sheet embodiment 2 of the utility model.

[0023] Fig.10 It is a schematic diagram of the magnetic pole structure after molding of the magnetic sheet embodiment 3 of the utility model.

[0024] Fig.11 It is a schematic diagram of the magnetic pole structure after molding of the magnetic sheet embodiment 4 of the utility model.

[0025] As shown in the figure: 1. Molding cavity, 1.1. Magnetic sheet, 2. Upper die seat, 2.1. Alignment hole, 2.2. Upper die cavity seat, 3. Lower die seat, 3.1. Alignment column, 3.2. Lower die cavity seat, 3.2.1. Water-cooling runner, 4. Upper die coil, 5. Lower die coil, 6. Ejector, 6.1. Ejector seat, 7. Gap, 8. Upper forming frame, 9. Lower forming frame, 10. Injection channel, 10.1. Ejector, 10.1.1 Limit block, 11. Upper disassembly hole, 12. Lower disassembly hole. DETAILED DESCRIPTION

[0026] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0027] like Figure 1-3 As shown, a coil orientation molding mold comprises a molding cavity 1 for molding a magnetic sheet 1.1, the molding cavity 1 is formed by splicing an upper mold base 2 and a lower mold base 3, an upper mold coil 4 is wound around the circumference of the upper mold base 2, and a lower mold coil 5 is wound around the circumference of the lower mold base 3, the winding directions of the upper mold coil 4 and the lower mold coil 5 are the same, a ejector pin 6 is movably connected in the lower mold base 3, the end surface of the ejector pin 6 close to the upper mold base 2 is used to splice into the lower end surface of the molding cavity 1, the ejector pin 6 is made of magnetic steel, the upper mold base 2 and the lower mold base 3 are made of non-magnetic steel, during molding, the upper mold base 2 and the lower mold base 3 are abutted against each other, a gap 7 is provided between the upper mold coil 4 and the lower mold coil 5, and the molding cavity 1 is provided in the gap 7 between the upper mold coil 4 and the lower mold coil 5.

[0028] like Figure 1As shown, the outer circle of the upper mold coil 4 is provided with an upper molding frame 8 for molding the upper mold coil 4, and the outer circle of the lower mold coil 5 is provided with a lower molding frame 9 for molding the lower mold coil 5. The upper molding frame 8 and the lower molding frame 9 arranged on the same side are staggered.

[0029] like Figure 4 , Figure 5 As shown, the upper die seat 2 is provided with a plurality of alignment holes 2.1 on the circumference thereof, and the lower die seat 3 is provided with a plurality of alignment posts 3.1 corresponding to the alignment holes 2.1 on the circumference thereof.

[0030] like Figure 5 , Figure 6 As shown, the upper mold base 2 is provided with an injection channel 10 for injecting magnetic particle material into the molding cavity 1 , and a plurality of molding cavities 1 are provided, and the plurality of molding cavities 1 are evenly distributed in an array along the circumference of the injection channel 10 .

[0031] like Figure 2-5 As shown, the upper mold base 2 is provided with an upper mold cavity base 2.2 for molding the upper end of the molding cavity 1, and the upper mold cavity base 2.2 is detachably connected to the upper mold base 2, and the lower mold base 3 is provided with a lower mold cavity base 3.2 for molding the lower end of the molding cavity 1, and the lower mold cavity base 3.2 is detachably connected to the lower mold base 3, and the four corners of the upper mold base 2 are provided with upper disassembly holes 11, and the four corners of the lower mold base 3 are provided with lower disassembly holes 12, and the ejector pin 6 is detachably connected to the ejector pin base 6.1, and the ejector pin base 6.1 is movably connected to the side of the lower mold base 3 away from the upper mold base 2 along the axial direction of the ejector pin 6, and a material channel ejector pin 10.1 is also detachably connected to the ejector pin base 6.1, and the material channel ejector pin 10.1 is arranged along the axial direction of the injection channel 10, and when the ejector pin 6 ejects the magnetic sheet 1.1, the material channel ejector pin 10.1 will eject the injection molded magnetic particle material in the injection channel 10. The material channel ejector pin 10.1 is made of non-magnetic steel, and the ejector pin seat 6.1 is composed of two clamping plates. The end of the ejector pin 6 away from the molding cavity 1 and the end of the material channel ejector pin 10.1 away from the molding cavity 1 are both provided with a limit block 10.1.1, and the limit block 10.1.1 is fixedly connected between the two clamping plates. Figure 3 Due to cross-sectional reasons, only the limit block 10.1.1 on the material channel ejector pin 10.1 is shown.

[0032] like Figure 7 As shown, a water cooling channel 3.2.1 is also provided on the circumference of the lower mold cavity seat 3.2, and the water cooling channel 3.2.1 is used to install a water cooling pipe for controlling the mold temperature of the molding cavity 1.

[0033] like Figure 8 , Fig. 9 As shown, when the current directions of the upper mold coil 4 and the lower mold coil 5 are the same, a magnetic sheet 1.1 with oriented magnetic field poles distributed along the axial direction can be formed.

[0034] like Fig.10 , Fig.11 As shown, when the current directions of the upper mold coil 4 and the lower mold coil 5 are opposite, a magnetic sheet 1.1 with oriented magnetic field poles distributed along the radial direction can be formed.

[0035] During the orientation molding process, the current of the upper mold coil 4 and the lower mold coil 5 can be adjusted to achieve the molding of magnetic sheets 1.1 with different orientation magnetic field strengths and different magnetic field distributions, making the coil orientation molding mold more applicable. In addition, because the upper mold coil 4 and the lower mold coil 5 are used instead of traditional neodymium iron boron magnets, the production cost of the mold is reduced.

[0036] The above description is only for the best embodiment of the utility model, but it cannot be understood as a limitation of the claims. The utility model is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the protection scope of the independent claims of the utility model are within the protection scope of the utility model.

Claims

1. A coil orientation forming die, characterized in that: The invention comprises a molding cavity (1) for molding a magnetic sheet (1.1), wherein the molding cavity (1) is formed by splicing an upper mold base (2) and a lower mold base (3), an upper mold coil (4) is wound around the circumference of the upper mold base (2), and a lower mold coil (5) is wound around the circumference of the lower mold base (3), the upper mold coil (4) and the lower mold coil (5) have the same winding direction, and an ejector pin (6) is movably connected inside the lower mold base (3), and the end surface of the ejector pin (6) close to the upper mold base (2) is used for splicing into the lower end surface of the molding cavity (1), and the ejector pin (6) is made of magnetic steel, and the upper mold base (2) and the lower mold base (3) are made of non-magnetic steel.

2. The coil orientation forming die according to claim 1, characterized in that: During molding, the upper mold base (2) and the lower mold base (3) abut against each other, a gap (7) is provided between the upper mold coil (4) and the lower mold coil (5), and the molding cavity (1) is provided in the gap (7) between the upper mold coil (4) and the lower mold coil (5).

3. The coil orientation forming die according to claim 2, characterized in that: The outer ring of the upper mold coil (4) is provided with an upper molding frame (8) for molding the upper mold coil (4), and the outer ring of the lower mold coil (5) is provided with a lower molding frame (9) for molding the lower mold coil (5). The upper molding frame (8) and the lower molding frame (9) arranged on the same side are staggered.

4. The coil orientation forming die according to claim 1, characterized in that: The upper die seat (2) is provided with a plurality of alignment holes (2.1) on the circumference thereof, and the lower die seat (3) is provided with a plurality of alignment posts (3.1) corresponding one-to-one to the alignment holes (2.1) on the circumference thereof.

5. The coil orientation forming die according to claim 1, characterized in that: The upper mold base (2) is provided with an injection channel (10) for injecting magnetic particle material into the molding cavity (1), and a plurality of molding cavities (1) are provided, and the plurality of molding cavities (1) are evenly distributed in an array along the circumference of the injection channel (10).

6. The coil orientation forming die according to claim 1, characterized in that: The upper die base (2) is provided with an upper die cavity base (2.2) for forming the upper end of the molding cavity (1), and the upper die cavity base (2.2) is detachably connected to the upper die base (2); the lower die base (3) is provided with a lower die cavity base (3.2) for forming the lower end of the molding cavity (1), and the lower die cavity base (3.2) is detachably connected to the lower die base (3); the ejector pin (6) is detachably connected to the ejector pin base (6.1), and the ejector pin base (6.1) is movably connected to a side of the lower die base (3) away from the upper die base (2) along the axial direction of the ejector pin (6).

7. The coil orientation forming die according to claim 6, characterized in that: Upper disassembly holes (11) are provided at the four corners of the upper die base (2), and lower disassembly holes (12) are provided at the four corners of the lower die base (3).

8. The coil orientation forming die according to claim 6, characterized in that: A water cooling channel (3.2.1) is also provided on the circumference of the lower mold cavity seat (3.2), and the water cooling channel (3.2.1) is used to install a water cooling pipe for controlling the mold temperature of the molding cavity (1).

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