CN105149581A - Method for preventing strain cracking of ES magnetic core during sintering - Google Patents
Method for preventing strain cracking of ES magnetic core during sintering Download PDFInfo
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- CN105149581A CN105149581A CN201510589964.9A CN201510589964A CN105149581A CN 105149581 A CN105149581 A CN 105149581A CN 201510589964 A CN201510589964 A CN 201510589964A CN 105149581 A CN105149581 A CN 105149581A
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Abstract
The invention discloses a method for preventing strain cracking of an ES magnetic core during sintering. According to the method, the ES magnetic core after pressing is sintered through a sintering kiln, wherein the sintering kiln comprises a first heating zone, a second heating zone, a heat preservation zone and a cooling zone, the length of the first warming zone is 6m, the ES magnetic core is heated slowly to 300 DEG C from the normal temperature, and the heating time is 5h, the length of the second heating zone is 11m, the ES magnetic core is heated to 1300 DEG C from 300 DEG C, and the heating time is 9h; the length of the heat preservation zone is 8m, the heat of the ES magnetic core is kept for 6.5h at 1320-1345 DEG C; the length of the cooling zone is 13m, and the cooling time is 10.5h. With the adoption of the method, the sintering distance of the heating zones at 0-300 DEG C is prolonged, the distance of a glue discharge zone is shortened, through the conversion between the sintering distance of the heating zones at 0-300 DEG C and the distance of a glue discharge zone, the temperature of an inlet is adjusted, and rises slowly and steadily to complete the volatilization process of water of 0-300 DEG C.
Description
Technical field
The application relates to a kind of electromagnetic oven magnetic core, particularly relates to a kind of method avoiding strain cracking in ES magnetic core sintering process.
Background technology
Because ES type core shapes is irregular, the length of center pillar both sides is different, uses lamination sintering, and because magnetic core affects by naturally dropping in sintering process, product can be sagging, and be easy to distortion, irregularity degree can reach more than 0.6mm, cannot meet≤0.30mm requirement,
In addition, ES type magnetic core specification because of area large, have little time because moisture content volatile quantity greatly often volatilizees at heating zone 0 ~ 300 degree of sintering stage, enter rear heating zone to meet high temperature moisture content and volatilize rapidly and be split up, have a strong impact on the qualification rate of magnetic core product, realize not ftractureing by reducing kiln speed, but have a strong impact on production capacity and efficiency.
Summary of the invention
The object of the present invention is to provide a kind of method avoiding strain cracking in ES magnetic core sintering process, to overcome deficiency of the prior art.
For achieving the above object, the invention provides following technical scheme:
The embodiment of the present application discloses a kind of method avoiding strain cracking in ES magnetic core sintering process, and adopt sintering kiln to sinter the ES magnetic core suppressed, this sintering kiln comprises the first heating zone, the second heating zone, heat preservation zone and cooling down district, wherein:
First heating zone length is 6 meters, and ES magnetic core is slowly warming up to 300 DEG C from normal temperature temperature, and the heating-up time is 5 hours;
Second heating zone length is 11 meters, and ES magnetic core is warming up to 1300 DEG C from 300 DEG C, and the heating-up time is 9 hours
Heat preservation zone length is 8 meters, by ES magnetic core 1320-1345 DEG C of insulation 6.5 hours;
Cooling area length is 13 meters, 10.5 hours cool times.
Preferably, avoid in the method for strain cracking in ES magnetic core sintering process above-mentioned, described ES magnetic core comprises the main part being positioned at horizontal plane, this main part has relative inner edge and outside, and the first side be connected between inner edge and outside and second side, the width of described inner edge is less than the width of described outside, the shape of described first side and second side is arc, and the arc of described first side and second side has identical recessed direction, the shape of described inner edge and outside is the arc arranged with one heart, described inner edge and outside protrude out the first flange and second flange of arc respectively, described first flange and the second flange are perpendicular to described main part and be positioned at the same side of described main part, the 3rd flange of arc is also formed between described first flange and the second flange, described 3rd flange and described first flange, second flange is arranged with one heart, distance between described 3rd flange and the first flange is less than the distance between described 3rd flange and the second flange.
Preferably, avoid in the method for strain cracking in ES magnetic core sintering process above-mentioned, the edge that described first side and second side are positioned at the first flange and the second flange side is formed with the first anticracking inclined-plane, the angle of described first anticracking inclined-plane and vertical direction is 15 °, and the ratio between the height on described first anticracking inclined-plane and main part thickness is 14:19.
Preferably, avoid in the method for strain cracking in ES magnetic core sintering process above-mentioned, the edge of described first side and away from flange side, second side is formed with the second anticracking inclined-plane.
Preferably, avoid in the method for strain cracking in ES magnetic core sintering process above-mentioned, the ratio between the height on described second anticracking inclined-plane and main part thickness is 1/228.
Preferably, avoid in the method for strain cracking in ES magnetic core sintering process above-mentioned, the recessed notch being formed with rectangle in middle part of described second flange.
Preferably, avoid in the method for strain cracking in ES magnetic core sintering process above-mentioned, in sintering process, multiple described ES magnetic core superposes setting up and down, the main part being positioned at the ES magnetic core of top and the first flange being positioned at the ES magnetic core below it, the second flange and the 3rd Hp contacts, be provided with back-up block between two neighbouring ES magnetic cores, the thickness of described back-up block equals the spacing between adjacent two ES magnetic cores, and described back-up block is between described 3rd flange and the second flange.
Preferably, avoid in the method for strain cracking in ES magnetic core sintering process above-mentioned, described back-up block is RM type magnetic core.
Compared with prior art, the invention has the advantages that: above one end of longer distortion, burn a title technology by pad, adopt RM type magnetic core, compacting height dimension is deeply consistent with ES die cavity, decline when naturally sintering and have the support of contour RM magnetic core, can effectively solve modification problem, and RM magnetic core also can use, considerably increase output, reduce production cost; Extend heating zone 0 ~ 300 degree sintering distance, shorten binder removal offset from rice, by both conversions, adjustment inlet temperature, makes the process of its 0 ~ 300 degree of moisture content volatilization that slowly steadily heats up.Use above new technology, make production effect improve 30%, product percent of pass rises 15%
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Figure 1 shows that the schematic perspective view for the magnetic core of electromagnetic oven in the specific embodiment of the invention;
Figure 2 shows that the magnetic core side view for electromagnetic oven in the specific embodiment of the invention;
Figure 3 shows that sectional view in Fig. 2;
Figure 4 shows that the superposed positions schematic diagram of ES magnetic core in sintering process in the specific embodiment of the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be described in detail the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Shown in ginseng Fig. 1, for the ES magnetic core of electromagnetic oven, comprise the main part 1 being positioned at horizontal plane, this main part has relative inner edge 11 and outside 12 and the first side 13 be connected between inner edge 11 and outside 12 and second side 14, the width of inner edge 11 is less than the width of outside 12, the shape of first side 13 and second side 14 is arc, and the arc of first side 13 and second side 14 has identical recessed direction.
Further, the shape of inner edge 11 and outside 12 is the arc arranged with one heart.Inner edge 11 and outside 12 protrude out the first flange 2 of arc and the second flange 3, first flange 2 and the second flange 3 respectively perpendicular to main part 1 and are positioned at the same side of main part 1.The 3rd flange the 4, three flange 4 and the first flange 2, second flange 3 that are also formed with arc between first flange 2 and the second flange 3 are arranged with one heart.Distance between 3rd flange 4 and the first flange 2 is less than the distance between the 3rd flange 4 and the second flange 3.
Further, the recessed notch 31 being formed with rectangle in the middle part of the second flange 3.
In this technical scheme, the magnetic core for electromagnetic oven of the present invention effectively reduces electromagnetic radiation, improves the efficiency of heating surface of electromagnetic oven; Strong and weak according to Distribution of Magnetic Field; The fan-shaped combination not etc. of design magnetic stripe inner edge and outside two width, thus it is even to realize Distribution of Magnetic Field;
Shown in ginseng Fig. 2 and Fig. 3, the edge that first side 13 and second side 14 are positioned at flange side is formed with the first anticracking inclined-plane 131.
Further, the first anticracking inclined-plane 131 is 15 ° with the angle of vertical direction.
Further, the ratio between the height on the first anticracking inclined-plane 131 and main part 1 thickness is 14:19.
Further, the edge of first side 13 and away from flange side, second side 14 is formed with the second anticracking inclined-plane 132.Preferably, the ratio between the height on the second anticracking inclined-plane 132 and main part 1 thickness is 1/228.
It is low that prior art produces magnetic core qualification rate, and cost is high, and the magnetic core that generic homogeneous is divided equally all can realize multi-laminate and burn, and this kind of magnetic core can only sinter one deck, can not carry out folded burning, serious restriction kiln production production capacity, thus reduces the service efficiency of kiln.
For solving this technical problem, shown in composition graphs 4, the method of strain cracking in ES magnetic core sintering process is avoided to be: to adopt sintering machine to sinter the ES magnetic core suppressed, in sintering process, multiple ES magnetic core superposes setting up and down, the main part being positioned at the ES magnetic core of top and the first flange being positioned at the ES magnetic core below it, the second flange and the 3rd Hp contacts, back-up block 5 is provided with between two neighbouring ES magnetic cores, the thickness of back-up block 5 equals the spacing between adjacent two ES magnetic cores, and back-up block is between the 3rd flange and the second flange.Back-up block is preferably RM type magnetic core.
Sintering machine comprises the first heating zone, the second heating zone, heat preservation zone and natural cooling zone, wherein:
First heating zone length is 6 meters, and ES magnetic core is slowly warming up to 300 DEG C from normal temperature temperature, and the heating-up time is 5 hours;
Second heating zone length is 11 meters, and ES magnetic core is warming up to 1300 DEG C from 300 DEG C, and the heating-up time is 9 hours
Heat preservation zone length is 8 meters, by ES magnetic core 1320-1345 DEG C of insulation 6.5 hours;
Cooling area length is 13 meters, 10.5 hours cool times.
Relative to existing equipment, the present embodiment extends heating zone 0 ~ 300 degree sintering distance, shortens binder removal offset from rice, and by both conversions, adjustment inlet temperature, makes the process of its 0 ~ 300 degree of moisture content volatilization that slowly steadily heats up.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the detailed description of the invention of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of the application.
Claims (8)
1. avoid a method for strain cracking in ES magnetic core sintering process, it is characterized in that, adopt sintering kiln to sinter the ES magnetic core suppressed, this sintering kiln comprises the first heating zone, the second heating zone, heat preservation zone and cooling down district, wherein:
First heating zone length is 6 meters, and ES magnetic core is slowly warming up to 300 DEG C from normal temperature temperature, and the heating-up time is 5 hours;
Second heating zone length is 11 meters, and ES magnetic core is warming up to 1300 DEG C from 300 DEG C, and the heating-up time is 9 hours
Heat preservation zone length is 8 meters, by ES magnetic core 1320-1345 DEG C of insulation 6.5 hours;
Cooling area length is 13 meters, 10.5 hours cool times.
2. the method avoiding strain cracking in ES magnetic core sintering process according to claim 1, it is characterized in that: described ES magnetic core comprises the main part being positioned at horizontal plane, this main part has relative inner edge and outside, and the first side be connected between inner edge and outside and second side, the width of described inner edge is less than the width of described outside, the shape of described first side and second side is arc, and the arc of described first side and second side has identical recessed direction, the shape of described inner edge and outside is the arc arranged with one heart, described inner edge and outside protrude out the first flange and second flange of arc respectively, described first flange and the second flange are perpendicular to described main part and be positioned at the same side of described main part, the 3rd flange of arc is also formed between described first flange and the second flange, described 3rd flange and described first flange, second flange is arranged with one heart, distance between described 3rd flange and the first flange is less than the distance between described 3rd flange and the second flange.
3. the method avoiding strain cracking in ES magnetic core sintering process according to claim 2, it is characterized in that: the edge that described first side and second side are positioned at the first flange and the second flange side is formed with the first anticracking inclined-plane, the angle of described first anticracking inclined-plane and vertical direction is 15 °, and the ratio between the height on described first anticracking inclined-plane and main part thickness is 14:19.
4. the method avoiding strain cracking in ES magnetic core sintering process according to claim 2, is characterized in that: the edge of described first side and away from flange side, second side is formed with the second anticracking inclined-plane.
5. the method avoiding strain cracking in ES magnetic core sintering process according to claim 4, is characterized in that: the ratio between the height on described second anticracking inclined-plane and main part thickness is 1/228.
6. the method avoiding strain cracking in ES magnetic core sintering process according to claim 2, is characterized in that: the recessed notch being formed with rectangle in middle part of described second flange.
7. the method avoiding strain cracking in ES magnetic core sintering process according to claim 2, it is characterized in that: in sintering process, multiple described ES magnetic core superposes setting up and down, the main part being positioned at the ES magnetic core of top and the first flange being positioned at the ES magnetic core below it, the second flange and the 3rd Hp contacts, back-up block is provided with between two neighbouring ES magnetic cores, the thickness of described back-up block equals the spacing between adjacent two ES magnetic cores, and described back-up block is between described 3rd flange and the second flange.
8. the method avoiding strain cracking in ES magnetic core sintering process according to claim 7, is characterized in that: described back-up block is RM type magnetic core.
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| CN108922767A (en) * | 2018-07-17 | 2018-11-30 | 江苏佰迪凯磁性材料有限公司 | The sintering process of magnetic core |
| CN115863012A (en) * | 2022-12-26 | 2023-03-28 | 长兴柏成电子有限公司 | Magnetic core and sintering process thereof |
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Effective date of registration: 20170821 Address after: Suzhou City, Jiangsu province 215600 Zhangjiagang Nanzhuang Village yangshe Jiangsu Bai Dikai magnetic material Co. Applicant after: Jiangsu Bai Dikai magnetic material Co. Address before: 215618, Jiangsu Zhangjiagang Economic Development Zone Nanzhuang Industrial Zone Zhangjiagang Suzhou Bidike Magnetic Technology Co., Ltd. Applicant before: BDK Magnetech (Zhangjiagang) Co., Ltd. |
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