CN2332049Y

CN2332049Y - Device for increasing raial magnetic performance of isotropic ferrite bead by dry method

Info

Publication number: CN2332049Y
Application number: CN 97250589
Authority: CN
Inventors: 林毅; 王晶珠; 左珑; 孙岩; 王益海; 赵琳萍
Original assignee: MAGNETIC MATERIAL INST BEIJING MINING AND METALLURGY GENERAL INST
Current assignee: Beikuan Magnetic-material Science & Technology Co., Ltd.
Priority date: 1997-08-08
Filing date: 1997-08-08
Publication date: 1999-08-04
Anticipated expiration: 2007-08-08

Abstract

The utility model relates to a device for increasing raial magnetic performance of an isotropic ferrite bead by dry method, which is composed of an upper punch, a lower punch, a column core, and a mold cover. Two punches are made by using non magnetic conductive materials, and the column core is sheathed inside a mutually corresponding circular hole of the two punches; the mold cover is sheathed outside the column core and matches with the gap between the two punches to form a mold cavity of a pressed magnetic loop. The outside of the mold cover is evenly distributed and absorbed with more than three permanent magnets according to the certain polarity during use, magnetic powders are filled inside the mold cavity. After punching, a magnetic loop with high radical magnetic flux density can be processed.

Description

A kind of radially device of magnetic property of dry production isotropic ferrite magnet ring that improves

The utility model relates to the radially device of magnetic property of a kind of high dry production isotropic ferrite magnet ring, belongs to a kind of equipment of producing magnetic device.

Produce ferrite bead, the dry production that many employings are convenient to construct, but adopt this method, after sintering magnet ring into magnetic compression moulding, the magnetic of pressing direction is often greater than magnet ring magnetic radially, this requires perpendicular to the high magnet ring of pressing direction magnetic property for those, and is very unfavorable.

For improving the magnetic perpendicular to pressing direction of magnet ring, the magnetize way of line bag of have take to lay in the mould both sides, make the magnet ring molding space, produce radial magnetic field, this magnetic field, because of complex structure, need maintenance, the cost height, also must adopting of having a kind ofly exceeds 30% high-performance magnetic than common magnetic price and produces, so very inconvenient, be always one produce in the magnet ring a difficult problem.

The purpose of this utility model is that the radially device of magnetic property of a kind of improved raising dry production isotropic ferrite magnet ring will be provided, and it is simple in structure, and cost is low, and is easy to use, and can reach the radially requirement of magnetic property of raising magnet ring really.

The purpose of this utility model is achieved in that the radially device of magnetic property of this raising dry production isotropic ferrite magnet ring, by upper punch, low punch, post core and mould cover constitute, two drifts adopt non-magnet_conductible material to make, the post core retainer plate is in the corresponding mutually circular hole in two drift centers, the mould cover is enclosed within the post core outside, and match with the space between two drifts, form the die cavity of compacting magnet ring, in the mould cover outside, by certain polarity, the uniform permanent magnet that is adsorbed with more than three, during use, magnetic is packed in the die cavity, after the punching press, can be processed into the magnet ring that radial magnetic flux density significantly improves.

The utlity model has following advantage:

1, simple in structure, easy to operate, can produce perpendicular to the high magnet ring of pressing direction magnetic property: form the radial magnetic field of die cavity because of not adopting the line bag that magnetizes etc., and adopt permanent magnet to replace, thereby reduced the work of a series of maintenance line bags; And test shows, the magnet ring that adopts this device to produce is because of magnetic field intensity suits, its magnetic flux increases percentage can reach 25～43%, make product inner surface magnetic flux density improve 0.0160～0.0280T, magnetic property is greatly improved, and has satisfied the requirement of high-performance magnet ring.

2, production efficiency height, cost is low: because of the stable performance of mould external magnetic field, improved the rate of finished products of product, reduced maintenance expense required when adopting line packet generation magnetic field, simultaneously, can adopt common magnetic as raw material, thereby reduce cost.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof:

Fig. 1 is the utility model vertical section schematic diagram;

Fig. 2 is that the utility model is overlooked and permanent magnet is arranged schematic diagram;

Ginseng Fig. 1-2, this improves the device of raial magnetic performance of isotropic ferrite bead by dry method, consisted of by low punch 1, upper punch 2,

post core

3 and 4 in mould cover, it is characterized in that low punch 1, upper punch 2 all adopt non-magnet_conductible material to make, low punch 1 is provided with the circular hole mutual corresponding with upper punch 2 centers, post core 3 is sleeved in the circular hole of punch-center up and down, mould cover 4 is placed in the outside of post core 3, mould cover 4 equates with the thickness that will suppress magnet ring with the gap width of 3 in post core, mould cover 4 is sticked in the groove that is interconnected outside the drift and with upper low punch to become movingly, form die cavity 6 between the space of mould cover 4 and upper low punch, overlap 4 outsides at mould, by certain polarity, uniform absorption has the permanent magnet 5 more than three.

The non-magnet_conductible material that upper low punch adopts in the utility model can be potassium steel, antimagnetic steel and stainless steel, and post core 3 and mould cover 4 can adopt permeability magnetic material or non-magnet_conductible material, get final product such as potassium steel, before the die mould permanent magnet 5 is adsorbed on mould and overlaps 4 outer rear flank, making and producing average magnetic field intensity in the die cavity is 4-20KA/m (50-250Oe), the quantity of permanent magnet 5 is overlapped 4 outer shape with mould and is decided, need be with three to regular hexahedron, regular octahedron then needs four, by that analogy, and behind the magnetic of in die cavity, packing into, under the radial magnetic field effect, magnetic is partially oriented, and upper punch 2 is suppressed downwards, can finish molding procedure.

Embodiment 1: adopting this device to produce the magnet ring of external diameter 30mm, internal diameter 22.7mm, height 11mm, is the binding agent of magnetic with the polyvinyl alcohol, records the magnetic property such as the following table of moulding magnet ring:

Whether use this device	Do not use this device	Use this device
Whether use this device	Do not use this device	Use this device			Magnetic field intensity (KA/m) radially in the mould	0	3.98	7.960	15.920
Magnet ring inner surface magnetic flux density (T)	0.0650	0.0813	0.0853	0.0860	Magnetic field intensity (KA/m) radially in the mould	0	3.98	7.960	15.920
Magnet ring inner surface magnetic flux density (T)	0.0650	0.0813	0.0853	0.0860	Magnet ring inner surface magnetic flux density increment rate (%)	0	25.08	31.23	32.31

Embodiment 2: producing above-mentioned same magnet ring with this device, is binding agent with camphor, records moulding magnet ring magnetic property such as following table:

Whether use this device	Do not use this device	Use this device
Whether use this device	Do not use this device	Use this device			Magnetic field intensity (KA/m) radially in the mould	0	13.532	15.920	19.900
Magnet ring inner surface magnetic flux density (T)	0.0650	0.0875	0.0891	0.0930	Magnetic field intensity (KA/m) radially in the mould	0	13.532	15.920	19.900
Magnet ring inner surface magnetic flux density (T)	0.0650	0.0875	0.0891	0.0930	Magnet ring inner surface magnetic flux density increment rate (%)	0	34.62	37.08	43.08

Claims

1,-kind of raising dry production isotropic ferrite magnet ring is the device of magnetic property radially, by low punch (1), upper punch (2), post core (3) and mould cover (4) constitute, it is characterized in that low punch (1), upper punch (2) all adopts non-magnet_conductible material to make, low punch (1) is provided with and the mutual corresponding circular hole in upper punch (2) center, post core (3) is sleeved in the circular hole at low punch center, mould cover (4) is placed in the outside of post core (3), mould cover (4) equates with the thickness that will suppress magnet ring with gap width between post core (3), mould cover (4) is sticked in the groove that is interconnected outside the drift and with last low punch to become movingly, form die cavity (6) between the space of mould cover (4) and last low punch, in mould cover (4) outside, by certain polarity, the uniform permanent magnet (5) that is adsorbed with more than three.