CN109599261B

CN109599261B - Magnet manufacturing mold

Info

Publication number: CN109599261B
Application number: CN201811406626.7A
Authority: CN
Inventors: 何国栋
Original assignee: Hengdian Group DMEGC Magnetics Co Ltd
Current assignee: Hengdian Group DMEGC Magnetics Co Ltd
Priority date: 2018-11-23
Filing date: 2018-11-23
Publication date: 2020-11-13
Anticipated expiration: 2038-11-23
Also published as: CN109599261A

Abstract

The invention discloses a magnet manufacturing mold, which comprises a mold A plate and a mold B plate which can be closed, wherein a mold A fitting is arranged on the mold A plate, a mold B fitting is arranged on the mold B plate, the mold A fitting and the mold B fitting form a closed female mold after the mold A plate and the mold B plate are buckled, a magnet is positioned in the female mold, and the mold A plate and the mold B plate are made of non-magnetic materials; the magnetic conductivity of the B-mode fitting is smaller than that of the A-mode fitting. The invention has the beneficial effects that: the magnetic field strength in the middle of the magnet can be reduced, and the torsion of linear error and magnetic field loss can be reduced.

Description

Magnet manufacturing mold

Technical Field

The invention relates to the technical field of magnet molds, in particular to a magnet manufacturing mold.

Background

Chinese patent document CN202861398U discloses in 2013, 4/10, "a magnet mold structure for making a magnetic field on a central surface higher than magnetic fields on two side surfaces", which includes an upper mold, a lower mold, a tubular mold and a forming coil, wherein the forming coil is sleeved around the outer surface of the tubular mold; a rectangular upper pressing die is horizontally embedded in the horizontal plane of the lower end of the upper die, and the lower surface of the upper pressing die is movably arranged above the upper port of the tubular die; the upper surface of the lower die is a convex surface, and a lower pressing die with the same width as the lower die is fixedly connected to the convex surface at the upper end of the lower die; the upper die and the lower die are both made of magnetic conductive materials, and the upper pressing die and the lower pressing die are both made of non-magnetic conductive materials. The scheme aims to provide a magnet mold structure which weakens magnetic fields on two sides of a contact surface of a lower mold of a magnet and strengthens the magnetic field of the central surface of the magnet, so that the magnetic field of the central surface is higher than the magnetic fields of the surfaces on two sides. For other products, the strength of the middle magnetic field is close to that of the two magnetic fields as much as possible, and if the strength of the middle magnetic field is higher than that of the two magnetic fields, the linearity error and the torsion degree of the magnetic field vector are large, so that the design requirements cannot be met.

Disclosure of Invention

Based on the above problems, the present invention provides a mold for manufacturing a magnet, which can reduce the magnetic field strength in the middle of the magnet and reduce the torsion of linear errors and magnetic field loss.

In order to realize the purpose of the invention, the invention adopts the following technical scheme: a magnet manufacturing mold comprises a mold A plate and a mold B plate which can be closed, wherein a mold A fitting is arranged on the mold A plate, a mold B fitting is arranged on the mold B plate, the mold A fitting and the mold B fitting form a closed female mold after the mold A plate and the mold B plate are buckled, a magnet is positioned in the female mold, and the mold A plate and the mold B plate are made of non-magnetic materials; the magnetic conductivity of the B-mode fitting is smaller than that of the A-mode fitting.

The magnet manufacturing mold designed by the scheme comprises a mold A plate and a mold B plate which can be closed, and the closing direction can be the vertical direction and the horizontal direction. A mould fitting is installed on the mould A plate, and a B mould fitting is installed on the mould B plate. The A die part and the B die part form a female die after the A plate and the B plate of the die are buckled, and materials are formed in the female die to form the magnet, so that the A die part and the B die part are the parts which are firstly in direct contact with the magnet. The die a plate and the die B plate are made of a non-magnetic conductive material, such as stellite, HPM75, SUS304, copper, etc., and function as a magnetic shield. The A die part and the B die part are made of materials with different magnetic conductivity, such as 45#, P20, Cr12, SKH51 and the like. The magnetic conductivity of the B-die fitting is smaller than that of the A-die fitting, so that the performance of the middle part of the magnet can be reduced, and the magnetic field intensity of the middle part of the magnet is close to that of the two sides of the magnet.

Preferably, a B die insert is further arranged; an insert groove is formed in the surface, facing the female die, of the die B accessory, and the die B insert is adaptively embedded in the insert groove; the die insert B corresponds to the middle part of the cross section of the female die; the material of the B die insert is a non-magnetic material, and materials such as stellite, HPM75, SUS304, copper and the like can be adopted. In order to further reduce the magnetic field intensity of the middle part of the magnet, the B die insert is embedded in the B die part. The B die insert is made of a non-magnetic material, such as stellite, HPM75, SUS304, copper and the like, and is embedded in the B die fitting, and the B die insert corresponds to the middle part of the cross section of the female die and is in direct contact with the middle part of the molded magnet. Because the middle part of the magnet is contacted with the B die insert which is not magnetic conductive, the magnetic field intensity of the area is further reduced and is further close to the magnetic field intensity of the areas on two sides.

Preferably, the cross-sectional width of the female die is L, and the width of the B die insert is L L: L, which is in the range of 4-8. L is distributed in the range, and the influence of the non-magnetic B die insert on the magnetic field intensity of the middle area of the magnet is optimal.

Preferably, the height of the cross section of the B die part is H, the height of the B die insert is H, and the value range of H to H is 1.2-1.6. H is distributed in the range, and the influence of the non-magnetic B die insert on the magnetic B die accessory in the thickness direction achieves the best effect.

Preferably, the height of the cross section of the female die is K, the height of the B die insert is h, and the value range of K: h = is 0.2-0.5. And similarly, the K: h is within the range of 0.2-0.5, the height of the B die insert is relatively proper, and the B die insert can be matched with the cross section height of the female die, so that the influence of the magnetic field of the B die accessory on the magnet in the female die is minimized.

Preferably, the A-die assembly further comprises a feed channel; the feeding channel extends along the involution direction of the die A plate and the die B plate, and the inner side opening is positioned in the center of one side of the die A accessory of the female die. According to the scheme, the feeding channel is arranged on one side of the A die part, and the opening on the inner side of the feeding channel is positioned in the center of one side of the A die part of the female die, so that the forming speed of one side of the B plate of the die of the magnet can be higher, and the magnetic field performance can be determined earlier.

In conclusion, the beneficial effects of the invention are as follows: the magnetic field strength in the middle of the magnet can be reduced, and the torsion of linear error and magnetic field loss can be reduced.

Drawings

FIG. 1 is a cross-sectional view of a mold of the present invention.

Fig. 2 is a perspective view of the final magnet product of the present invention.

Wherein: the die comprises a die A plate 1, a die B plate 2, a die fitting 3A, a die fitting 4B, a female die 5, a die insert 6B and a feed channel 7.

Detailed Description

The invention is further described with reference to the following detailed description and accompanying drawings.

The embodiment shown in fig. 1 is a magnet manufacturing mold, which comprises a mold a plate 1 and a mold B plate 2 which can be combined up and down, wherein the mold a plate is arranged below the mold B plate. A mould fitting 3 is installed on a mould A plate, a B mould fitting 4 is installed on a mould B plate, the A mould fitting and the B mould fitting are made of magnetic conductive materials, 45# steel is used in the embodiment, and the magnetic conductivity of the B mould fitting is smaller than that of the A mould fitting. The A die fitting and the B die fitting form a closed female die 5 after the A plate and the B plate of the die are buckled, and the female die is used for forming a magnet. The final magnet product in this example is shown in fig. 2 and has a substantially rectangular parallelepiped structure, and a rod member extends from each end.

The material of the die A plate and the die B plate is non-magnetic material SUS 304. And the surface of the B die fitting facing the female die is provided with an insert groove, a B die insert 6 is embedded in the insert groove in a matching manner, and the B die insert corresponds to the middle part of the cross section of the female die. The material of the B die insert is stellite alloy which is a non-magnetic material. The cross section width of the female die is L, the width of the B die insert is L, the value range of L to L is 4-8, and the value range is 6 in the embodiment; the height of the cross section of the B die accessory is H, the height of the B die insert is H, the value range of H to H is 1.2-1.6, and the value range of H is 1.3; the height of the cross section of the female die is K, the height of the B die insert is h, the value range of K: h = is 0.2-0.5, and the value range is 0.4 in the embodiment.

The A-die assembly further comprises a feed channel 7; the feeding channel extends along the up-down involution direction of the die A plate and the die B plate, and the inner side opening is positioned in the center of one side of the die A accessory of the upper end female die.

The case of detection with the magnet manufactured by the magnet manufacturing mold of the present example: the planar dipolar magnetization of the magnet is carried out, the center of the sensor is placed at the central position of the magnet in the Z direction, the distance from the surface of the magnet is respectively 1.9mm, 2.3mm, 3.0mm and 3.4mm, the detection is carried out for 4 times, the measuring range is +/-4.5 mm in the middle of the magnet, the magnetic field intensity is larger than 39.25MT, and the standards of linear error Max = +/-3% and distortion +/-0.75% of magnetic field loss are met.

Claims

1. A magnet manufacturing die comprises a die A plate (1) and a die B plate (2) which can be closed, wherein a die A accessory (3) is installed on the die A plate, a die B accessory (4) is installed on the die B plate, the die A accessory and the die B accessory form a closed female die (5) after the die A plate and the die B plate are buckled, and a magnet is positioned in the female die; the magnetic conductivity of the B die fitting is smaller than that of the A die fitting; a B die insert (6) is also arranged; an insert groove is formed in the surface, facing the female die, of the die B accessory, and the die B insert is adaptively embedded in the insert groove; the die insert B corresponds to the middle part of the cross section of the female die; the material of the B die insert is a non-magnetic material; the A mould part also comprises a feeding channel (7); the feeding channel extends along the involution direction of the die A plate and the die B plate, and the inner side opening is positioned in the center of one side of the die A accessory of the female die.

2. A mold for making a magnet according to claim 1, wherein the cross-sectional width of the female mold is L, the width of the B mold insert is L, and L/L is in the range of 4 to 8.

3. A magnet fabrication tool as claimed in claim 1 or claim 2, wherein the cross-sectional height of the B-die fitting is H, the height of the B-die insert is H, and H is in the range of 1.2 to 1.6.

4. A magnet production mold as claimed in claim 3, wherein the cross-sectional height of the female mold is K, the height of the B mold insert is h, and K: h = is in the range of 0.2-0.5.