Annular magnetic hub for powder metallurgy and preparation method thereof

A powder metallurgy, ring-shaped technology, applied in the manufacture of stator/rotor body, magnetic circuit characterized by magnetic materials, etc., can solve the problems of low work efficiency, large volume, easy to heat, etc., to improve production efficiency, product quality High precision and improved magnetic permeability

Inactive Publication Date: 2010-12-29
吕元之
4 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

But there are also the following disadvantages: first, the iron loss is large, and it is easy to generate heat; second, the frequency of use is low, generally it can only work below 20KHZ, and the work efficiency is low; third, it is large and heavy, and it is inconvenient to in...
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Method used

(5), finishing process: adopt YZ79-500 press machine, two upper and two lower formwo...
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Abstract

The invention discloses an annular magnetic hub for powder metallurgy and a preparation method thereof, which are characterized in that: the annular magnetic hub is formed by circular rings; the inner diameter of each circular ring is 204.75 millimeters, the outer diameter of each circular ring is 213 millimeters, and the height of each circular ring is 24 millimeters; rectangular magnetic teeth with rectangular cross sections are arranged on the inner walls of the circular rings, and the width of each rectangular magnetic tooth is 3 millimeters; the distance between the adjacent rectangular magnetic teeth is 10.8 millimeters, and the rectangular magnetic teeth are 46; a groove of which the depth is between 0.01 and 0.2 millimeter and the width is between 1 and 3 millimeters is formed on the inner wall of the circular ring between the adjacent rectangular magnetic teeth; and the circular rings and the rectangular magnetic teeth comprise the following components in part by weight: 100 parts of pure iron powder and 0.5 to 1 part of lubricant. A finished product of the annular magnetic hub is formed by die manufacturing, mixing, press forming, sintering and finishing. The annular magnetic hub improves the magnetic conductivity greatly, so that the saturation induction density is the same as that of the magnetic hubs manufactured by silicon-steel plates.

Application Domain

Magnetic circuit characterised by magnetic materialsManufacturing stator/rotor bodies

Technology Topic

Image

  • Annular magnetic hub for powder metallurgy and preparation method thereof
  • Annular magnetic hub for powder metallurgy and preparation method thereof
  • Annular magnetic hub for powder metallurgy and preparation method thereof

Examples

  • Experimental program(3)

Example Embodiment

[0034] Example 1
[0035] Refer to attached figure 1 , 2 Preparation of the present invention. figure 1 , 2 An embodiment of a powder metallurgy circular magnetic hub prepared by the present invention is given. The powder metallurgy annular magnetic hub is characterized in that it is composed of a ring 1, the inner diameter of the ring 1 is 204.75mm, the outer diameter of the ring 1 is 213mm, and the height of the ring 1 is 24mm. There are rectangular magnetic teeth 2 with a rectangular cross section on the inner wall of the inner wall, the width of the rectangular magnetic teeth 2 is 3 mm, the distance between adjacent rectangular magnetic teeth 2 is 10.8 mm, and there are 46 rectangular magnetic teeth 2 in total. The inner wall of the ring 1 between the teeth 2 is provided with a groove 3 with a depth of 0.2 mm and a width of 2 mm; the composition of the ring 1 and its rectangular magnetic teeth 2 is as follows: the weight of pure iron powder is 100 Part, the weight of lubricant is 0.8 part.
[0036] The pure iron powder, wherein iron content ≥ 98.36%, carbon content 0.05-0.10%, silicon content 0.05-0.12%, manganese content 0.10-0.30%, phosphorus content 0.03-0.05%, sulfur content 0.03-0.05%, hydrochloric acid The insoluble matter content is 0.10-0.30%, and FHY80.27 iron powder produced by Shandong Laigang Group Powder Metallurgy Co., Ltd. is used.
[0037] Described lubricant is zinc stearate.
[0038]A preparation method of the powder metallurgy annular magnetic hub of embodiment 1 as above, comprising the following production steps:
[0039] (1), making molds: image 3 , 4 , 5, 6 gives a special mold map. The mold includes a mold cover 6, a mandrel 4, an upper die punch 5 and a mold base. The inner diameter of the mold cavity of the mold casing 6 is determined by multiplying the outer diameter of the ring 1 by the expansion coefficient, the height is 4 times the height of the ring 1, the inner surface finish is 0.8, and the material is Cr 12 m 0 V, the surface hardness is HRC61-63, placed on the formwork, mainly to determine the shape of the powder metallurgy circular magnetic hub; the outer diameter of the mandrel 4 is similar to the inner diameter of the ring 1, according to the inner diameter of the ring 1 multiplied Determined by the expansion coefficient, the surface finish is 0.8, and the material is Cr 12 m 0 V, the surface hardness is HRC61-63, and the outer wall of the mandrel 4 is provided with a convex groove that meshes with the rectangular magnetic teeth 2 and the groove 3 on the inner wall of the powder metallurgy ring magnetic hub, so that the powder metallurgy ring The ring 1 of the magnetic hub and the rectangular magnetic teeth 2 and the groove 3 on the inner wall are finalized; The dies 5 are the same, but in opposite directions, and the inner wall is provided with the same convex corrugation as the rectangular magnetic tooth 2 and the groove 3 on the inner wall of the ring 1; the die frame is three layers of floating, and the bottom layer is a flat plate, which is used as a horizontal workbench .
[0040] (2) Mixing: Use pure iron powder as raw material, weigh 100 parts, add 0.8 parts of lubricant, use double-cone mixer, mix for 45 minutes, make it evenly mixed, pure iron powder is Shandong Laigang FHY80.27 iron powder produced by Group Powder Metallurgy Co., Ltd.
[0041] (3) Press forming: use YZ79-315 press, three upper and two lower mold frames to press, put the mixed pure iron powder into the mold cavity, and use the upper and lower punches to simultaneously press the pure iron powder in the mold cavity from the upper and lower directions. Iron powder is stamped, and the stamping force is 8 tons/cm 3 , Finally, under the action of the drawing force of the mold base, the formed blank is ejected with the lower die 5 .
[0042] (4) Sintering: use a mesh belt furnace for sintering, and lay horizontal refractory porcelain plates in the sintering furnace. The side length of each refractory porcelain plate is 5cm larger than the outer diameter of the powder metallurgy circular magnetic hub, and the blank is placed vertically On the refractory porcelain plate, the sintering temperature is 1130°C, sintering at high temperature for 45 minutes, and cooling with the furnace. During this sintering process, the added lubricant evaporates.
[0043] (5) Finishing processing: YZ79-500 press is used, two upper and two lower mold bases are used for pressing, and the precision of the shaped product is guaranteed through high-precision molds.
[0044] The powder metallurgy annular magnetic hub formed by the above ratio and preparation process is randomly sampled in one furnace, and after testing, its technical indicators are as follows:
[0045] Average Density: 6.10
[0046] Average sintering hardness: HB60.

Example Embodiment

[0047] Example 2
[0048] The shape and manufacturing process steps of the powder metallurgy magnetic hub are the same as those in Example 1. However, improvements have been made in the ratio and where there is a limited interval: the composition of the ring 1 and its rectangular magnetic teeth 2 is as follows: the weight of pure iron powder is 100 parts, and the weight of lubricant is 1 part.
[0049] The depth of the groove 3 provided on the inner wall of the ring 1 between adjacent magnetic teeth 2 is changed to 0.1mm, and the width is changed to 3mm. After mixing, molding, pressing, sintering, cooling, and finishing, it is processed into products. In the mixing step, use pure iron powder as raw material, weigh 100 parts by weight, add 1 part of lubricant, and use a double-cone mixer for 50 minutes of mixing. In the sintering step, the sintering temperature is 1133°C, sintering at high temperature for 60 minutes, and cooling with the furnace. During this sintering process, the added lubricant evaporates.
[0050] The magnetic hubs prepared according to the above ratio and process are randomly sampled in a furnace, and 100 are randomly sampled. After testing, the technical indicators are as follows:
[0051] Average Density: 6.15
[0052] Average sintering hardness: HB55.

Example Embodiment

[0053] Example 3
[0054] The shape and preparation process of the powder metallurgy magnetic hub are the same as in Example 1, but improvements have been made in the ratio and where there are interval limits: the composition of the ring 1 and its rectangular magnetic teeth 2 is: pure iron powder The weight is 100 parts, and the weight of the lubricant is 0.5 parts.
[0055] The depth of the groove 3 provided on the inner wall of the ring 1 between adjacent magnetic teeth 2 is changed to 0.15mm, and the width is changed to 3mm. After mixing, molding, pressing, sintering, cooling, and finishing, it is processed into products. In the mixing step, pure iron powder is used as a raw material, weighing 100 parts, plus 0.5 part of lubricant, using a double-cone mixer, and mixing for 40 minutes. In the sintering step, the sintering temperature is 1127°C, sintering at high temperature for 40 minutes, and cooling with the furnace. During this sintering process, the added lubricant evaporates.
[0056] The magnetic hubs prepared according to the above ratio and process are randomly sampled in a furnace, and 100 are randomly sampled. After testing, the technical indicators are as follows:
[0057] Average Density: 6.01
[0058] Average sintering hardness: HB50.
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PUM

PropertyMeasurementUnit
Inner diameter204.75mm
Outer diameter213.0mm
Height24.0mm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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