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Rapid curing method of silicon steel self-bonding coating iron core

A self-adhesive coating, fast curing technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc. The uniformity of the silicon steel sheet is difficult to cover, so as to improve the heating and curing efficiency, improve the processing and forming efficiency, and optimize the curing process parameters.

Pending Publication Date: 2021-12-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the size of the silicon steel sheet core increases, due to the skin layer effect of induction heating, the heating area is mainly concentrated in a very narrow area on the surface of the silicon steel sheet. Heating is carried out by heat conduction from the surface inward, and the internal temperature is lower than that of the surface, which will cause a large difference in the bonding performance between the surface of the silicon steel sheet laminate and the core area. Local overheating will cause the coating to burn and fail, and local heat loss will cause The coating has poor adhesion, and the same problem exists in the axial direction of the iron core
Therefore, high-frequency induction heating cannot guarantee the uniformity of heating for large-sized silicon steel sheets, and it is difficult to cover a wide range of silicon steel sheet specifications.

Method used

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  • Rapid curing method of silicon steel self-bonding coating iron core
  • Rapid curing method of silicon steel self-bonding coating iron core
  • Rapid curing method of silicon steel self-bonding coating iron core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Heat and cure a cylindrical large-scale iron core with a size of φ290mm (outer diameter)*50mm (axial height). The peak temperature PMT of the self-adhesive coating metal of this large-scale iron core is 180°C. The power output of the induction heating system The frequency is 18KHz. The maximum holding temperature of a large iron core of this size is 280°C. When the heating time is ≥3min (usually 3-5min) and the holding time is ≥1min, better radial temperature uniformity can be obtained. The temperature difference between inside and outside is ≤50℃, please refer to the attached figure 2 And attached image 3 , with figure 2 is the change of the temperature inside and outside the radial direction of the iron core when the temperature rises for 3 minutes, with image 3 It is the change of the temperature inside and outside the radial direction of the iron core when the temperature is raised for 5 minutes. The thin line in the figure is the temperature outside the iron...

Embodiment 2-13

[0062] Embodiment 2-13: adopt the rapid curing method of the silicon steel self-adhesive coating iron core of the present invention to carry out rapid curing to 12 iron cores of different sizes and shapes, and the properties and parameters of the iron cores of embodiments 1-13 are shown in Table 2 , the corresponding rapid curing process parameters are shown in Table 3, and the corresponding curing effect parameters are shown in Table 4:

[0063] Table 2 Properties and parameters of 13 different silicon steel self-adhesive coated iron cores

[0064]

[0065]

[0066] Table 3 The rapid curing process parameters of 13 different silicon steel self-adhesive coating cores

[0067]

[0068]

[0069] Table 4 Parameters of curing effect of 13 different silicon steel self-adhesive coating cores

[0070]

[0071] In Table 4, the meanings of evaluation symbols are: ◎excellent; ○good; ⊙general.

[0072] It can be seen from Table 2 to Table 4 that the iron core made by the...

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Abstract

The invention discloses a rapid curing method for a silicon steel self-bonding coating iron core. An iron core is heated by adopting an induction heating system; the outer diameter of a small iron core is <= 100mm, the heat preservation temperature is 100-230 DEG C, and the heating time is 10-300 seconds; the outer diameter of a middle iron core is (100mm, 200mm], the heat preservation temperature is 100-250 DEG C, and the heating time is 1-20 min; and the outer diameter of a big iron core is (200mm, 360mm], the heat preservation temperature is 200-300 DEG C, the heating time is 9-30 minutes, the temperature rise time is greater than or equal to 7 minutes, and the heat preservation time is greater than or equal to 2 minutes. The heat dissipation piece can perform induction heating on iron cores with different sizes and shapes, so that the temperature distribution of the iron cores in the radial direction and the axial direction is uniform, the uniformity and the stability of the bonding strength of the iron cores are realized, and the heating and curing efficiency of the iron cores is improved.

Description

technical field [0001] The invention relates to a processing technology of a silicon steel core, in particular to a rapid curing method for a silicon steel self-adhesive coated iron core. Background technique [0002] According to the ASTM A976 standard, silicon steel self-adhesive coatings that can be classified as C-3 coatings are generally divided into two types: thermoplastic and thermosetting according to the film-forming mechanism. The thermoplastic coating formulation is composed of one or more copolymers of polyvinyl acetate, polyurethane, and polyacrylate. The heat required for secondary final state curing is relatively low, and the minimum reaction temperature is the metal The peak temperature PMT≤150℃, the heat resistance of the coating is poor; the thermosetting coating formula contains at least epoxy resin and its curing agent or accelerator, etc., more heat is required for the secondary final state curing, and the minimum reaction temperature is the metal peak ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/02
Inventor 李登峰金小礼王志成周月明王波李国保
Owner BAOSHAN IRON & STEEL CO LTD
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