CN1038209C - Method for manufacturing amorphous alloy thin band rectangle iron core - Google Patents

Abstract

The present invention discloses a manufacturing method of an amorphous soft magnetic alloy thin strip rectangular iron core for high power transformers. The method is a manufacturing process of an amorphous thin strip butt joint rectangular iron core which has high magnetic property, simple and feasible process and convenient batch production. The present invention has the main process that an amorphous alloy thin strip is cut and grouped according to a calculated length; each thin strip group is butt-jointed to form an annular iron core firstly; the annular iron core is then pressed in two mutual perpendicular radial directions and a rectangular iron core with four radian corners is formed by annealing.

Description

The manufacture method of amorphous alloy thin band rectangle iron core

The invention belongs to a kind of manufacture method of transformer core, mainly is the manufacture method of the high-power transformer rectangular core that is wound into by amorphous soft magnetic ribbon, and this method mainly comprises uncoiling, sub-cut, assembling, moulding and annealing.

Because amorphous soft magnetic ribbon hardness height, characteristics such as galvanizing embrittlement generally all are made into ring-shaped core and are used for transformer, can obtain the optimum magnetic energy like this.But for the high-power transformer greater than 500VA, because the number of turn of winding is a lot, but winding is to be formed by the hard copper pipe coiling that the hollow water flowing is cooled off sometimes, and ring-shaped core is just inapplicable.The C core that usually adopts the rectangle cutting to form, convenient so that winding inserts.But rectangular core is before cutting, must carry out dipping lacquer solidifies, make each layer amorphous thin ribbon relative fixed of coiling, when cutting, do not loose off, and then cutting forms C shape, such dipping lacquer and cutting two procedures all can bring magnetic unshakable in one's determination significantly to descend, and it seems that the permeability of the non-crystaline amorphous metal C core that general this method makes has only 2000～3000Gs/Oe, be quite low.

As far back as the sixties, a kind of manufacture method with mating interface iron core is disclosed among the United States Patent (USP) U S2927366.Because each layer band termination is butt joint, so interface unshakable in one's determination is more smooth, one side thickness at interface place can be greater than other three limits, but the technology that this patent is introduced must be earlier with strip coil coiled rectangle, loose winding forms polygonal and prepares for rewinding subsequently again, thereby makes this technology be only applicable to the making of silicon steel one class toughness and plasticity good crystalline state material iron core.And be high rigidity for the attitude of quenching, inductile; Annealed state is the amorphous material of high fragility, and the method is just inapplicable.

Chinese patent CN87105579A provides a kind of manufacture method that is applicable to the iron core with mating interface of non-crystalline material.Smooth with the interface unshakable in one's determination that this method is made, also can open the interface electric power coil of packing into after the annealing, but owing to shear the trouble that the rear port position is adjusted for removing band from, employing is cut the ring-shaped core of spooling by final interface position method makes corresponding Processes and apparatus all complicated, and makes the corresponding increase of cost.

The objective of the invention is the weak point for fear of above-mentioned prior art, provide a kind of with the sub-cut grouping of amorphous alloy ribbon elder generation, the method for butt joint high-power transformer rectangular core is made in assembling then.The magnetic levels unshakable in one's determination that makes with this process is high and simple for process, is convenient to especially produce in enormous quantities.

The purpose that the present invention makes high-power amorphous thin ribbon rectangle transformer core can reach by following measure, at first with raw material amorphous soft magnetic alloy (comprising ultramicro-crystal alloy) thin coiled stock uncoiling, if the thickness of this strip is t (general its thickness 0.02～0.04mm), the strip that with this thickness is t is the 1st by different length sub-cuts, 2,3 ... the W group, every group of N piece of strip section by equal length formed, the group that amounts to sub-cut is counted W and is satisfied T=WNt/ ρ, wherein [T] is the effectively folded thick of rectangular core section, ρ is the lamination coefficient of strip in rectangular core, and the length of respectively organizing strip is that rectangular core periphery length is as the criterion with the 1st group, and 2 π Nt/ ρ in proper order successively decrease.Then press rectangular core periphery length and make a ring-shaped outer layer sheath [3] with silicon steel sheet, press a Zhou Changdu making annular internal layer sheath [4] in the rectangular core again, then above-mentioned branch is cut the 1st, 2,3 ... W group strip group is docked by the length mode of successively decreasing and is assembled in the outer protective sleeve, till W has assembled, the silicon steel sheet internal layer sheath of packing at last, just form one by W group strip closed assembly, butt joint ring-shaped core with W mating interface, and count the length that the 1st interface and the 2nd interface staggers at ring-shaped core garden Zhou Fangxiang from the ring-shaped core skin should be less than the length of finished product rectangular core periphery minor face straight portion.Count the length of the 1st interface and the 2nd interface all minor face straight portion in length that garden Zhou Fangxiang staggers should be less than the finished product rectangular core from the ring-shaped core internal layer.The length that middle each interface and adjacent interface stagger is got it and is reduced to carry out the transition to the length that interior layer interface staggers gradually by the outer layer interface length that staggers.The butt joint ring-shaped core that next step will form again is from two mutually perpendicular radially exert pressure [P]; forming four turnings has the rectangular core of certain radian; at last this rectangular core is carried out annealing in process in 1 hour in 350～550 ℃ of insulations under protective atmosphere, just finished the manufacturing of the high-power amorphous soft magnetic ribbon rectangular core of this invention.

The present invention can realize by following measure, the thickness of general domestic and international existing amorphous soft magnetic ribbon (comprising the super-microcrystalline soft magnetic alloy strip) is all in the scope of 0.02～0.04mm, as far as possible little in order to guarantee mating interface place leakage field, and manufacture craft unshakable in one's determination is simple, experimental results show that strip piece number N=1～the 6th of the strip group that each branch cuts, and is desirable.In addition, in order further to simplify manufacture craft unshakable in one's determination, after particularly rectangular core annealing is finished, need winding is inserted unshakable in one's determination, then iron core must be opened at interface, iron core is installed after inserting winding, interface just can not be too many so again, otherwise too complicated in the operation, guaranteeing that the interface leakage field can not surpass on the basis that requires for this reason, reduce the number of interface as far as possible,, form the strip combination so can organize adjacent several merging in the strip group to the W that branch cuts.

The manufacture method of the high-power amorphous alloy thin band rectangle iron core of the present invention, owing to adopt amorphous alloy ribbon grouping butt joint, and the length of respectively organizing strip is as the criterion with rectangular core periphery length, 2 π Nt/ ρ in proper order successively decrease, make finished product interface basal area unshakable in one's determination not increase, and dock very tightly, leakage field is very little, has guaranteed the high level of magnetic.Owing to the intrinsic high resiliency of amorphous alloy ribbon, when successively the strip that divides into groups being assembled into ring-type silicon steel sheath, the strip group all has bigger exceptionally straight tension force, has guaranteed the high fill-factor of amorphous thin ribbon iron core simultaneously.Have four turnings of finished product rectangular core to be the shape of certain radian again, both guaranteed the density of corner, the stress of also having avoided sharp corner to produce is concentrated and is caused the decline of magnetic unshakable in one's determination.

Being described as follows of accompanying drawing drawing:

Fig. 1. the structural representation of the ring-shaped core that the amorphous alloy ribbon group forms in the inventive method.

Fig. 2. the schematic diagram of the inventive method amorphous alloy ribbon finished product rectangle butt joint core construction.

The present invention is described in further detail below in conjunction with embodiment:

Embodiment 1.

Select Fe for use ₇₈B ₁₃Si ₉The amorphous soft magnetic ribbon of (atom %) composition, bandwidth 20mm, tape thickness t=0.030mm adopts the present invention that this strip is pressed the different length sub-cut.Getting N=1, to get the laminate patch coefficient be 0.6, then poor according to two adjacent strip length during sub-cut $\frac{2\mathrm{\πNt}}{\mathrm{\ρ}}=\frac{2\×\mathrm{\π}\×1\×0.03}{0.6}=0.3\left(\mathrm{mm}\right)$ Mode is successively decreased, by outer perimeter 342mm unshakable in one's determination, and interior girth 295mm, folded thick T=15mm $W=\frac{\mathrm{T\ρ}}{\mathrm{Nt}}=\frac{15\×0.6}{1\×0.03}=300$ For reducing the interface number, merge butt joint with per 10 and form an interface, number of ports then unshakable in one's determination $\frac{W}{10}=\frac{300}{10}=30$ With strip by the length mode of successively decreasing put into Si steel loop shape sheath dock form a ring-shaped core after, pressurize in the two-phase vertical direction again, form rectangular core, after 380 ℃ of annealing, open interface, insert behind the coil and to restore interface is closed, survey its part static state and medium-high frequency performance and list in table 1, list file names with 3 rectangular cores (and treatment temperature is identical) comparative example that the strip that forms with batch spray is made in the table.1. wound core; 2. dipping lacquer iron core after reeling; 3. cutting C core and example of the present invention are done contrast behind the dipping lacquer.These group data show, the iron core that the present invention makes is lower than the wound core except that saturated magnetic strength, other performances are all close with the latter, even the iron core that is better than the latter and is better than greatly cutting behind dipping lacquer and the dipping lacquer, prove adopt this method to make power big (＞500VA) amorphous or ultramicro-crystal alloy transformer core has obvious superiority.

Table 1

	Manufacture	B10 (Gs)	Hc (Oe)	μm (×10 4)	P5/8K (W/Kg)	|μ|4/10K (×10 4)	P4/10K (W/Kg)	|μ|4/10K (×10 4)	P2/20K (W/Kg)	|μ|2/20K (×10 4)
											Example of the present invention	Staggered butt joint	10900	0.077	3.3	33.3	1.09	31.6	1.15	26.6	0.62
Comparative example 1	Reel	14400	0.12	1.94	32.7	0.82	35.8	0.95	29.4	0.53
											Comparative example 2	Dipping lacquer	10800	0.17	1.18	44.1	2.98	40.5	0.27	30.3	0.45
Comparative example 3	The dipping lacquer cutting	7750	0.20	0.2	80.2	0.05	78.6	0.05	55.4	0.06

The manufacture method of amorphous thin ribbon rectangular core of the present invention compared with the prior art its advantage is:

1. because to adopt amorphous alloy ribbon sub-cut grouping docking to form mating interface unshakable in one's determination, and respectively organize strip length and be as the criterion with rectangular core periphery length, the order 2 π Nt/ ρ that successively decrease, make finished product interface unshakable in one's determination near sectional area do not increase. Simultaneously docking is tight, and leakage field is very little, has guaranteed the high level of magnetic unshakable in one's determination.

2. because in advance with strip grouping or the combination of formation strip, the row docking forms iron core again, so that manufacture craft unshakable in one's determination is simplified, easy operating is convenient in batches large-scale production of tissue.

Claims (3)

1. the manufacture method of a high-power amorphous soft magnetic ribbon rectangular core, wind off volume comprising the amorphous soft magnetic ribbon that with thickness is t, according to the strip sub-cut of T=WNT/ ρ formula after with uncoiling is the W group, wherein N is piece number of every group of strip section, T is the effectively folded thick of rectangular core section, ρ is the lamination coefficient of strip in rectangular core, the length of the 1st group N piece strip section [1] equals the rectangular core outer perimeter, other are the 2nd years old, 3, W[2] group be as the criterion with the 1st group length, 2 π Nt/ ρ in proper order successively decrease, then W is organized the assembling of strip section, moulding and annealing is characterized in that:

(1) presses rectangular core periphery length with silicon steel sheet and make a ring-shaped outer layer sheath [3], press a Zhou Changdu making annular internal layer sheath [4] in the rectangular core again, by the length order of successively decreasing sub-cut is with 1 then, 2,3 ... W group strip is assembled in people's outer protective sleeve [3] successively, till W has assembled, the internal layer sheath [4] of packing at last, form one by W group strip closed assembly, butt joint ring-shaped core with W mating interface, and counting the length that the 1st interface and the 2nd interface staggers at the ring-shaped core circumferencial direction from the ring-shaped core skin should be less than the length [e] of finished product rectangular core periphery minor face straight portion, and count from the internal layer of ring-shaped core, the length that the 1st interface and the 2nd interface stagger in a circumferential direction should be less than the length [f] of all minor face straight portion in the finished product rectangular core, and the length that middle each interface and adjacent interface stagger is got it and reduced to carry out the transition to the length that interior layer interface staggers gradually by the outer layer interface length that staggers;

(2) above-mentioned annular is docked the amorphous thin ribbon iron core at two orthogonal radially exert pressure [P], form the rectangular core that there is certain radian at four turnings;

(3) with the rectangular core that forms under protective atmosphere, 350～550 ℃, be incubated 1 hour and carry out annealing in process;

2. the manufacture method of rectangular core according to claim 1 is characterized in that piece number N=1～6 of every group of strip section;

3. the manufacture method of rectangular core according to claim 1 is assembled into outer protective sleeve [3] before W being organized strip, W can be organized that adjacent several combinations also form the strip combination in the strip group.