CN109016090A - Anti- ET and RT class magnetic ferrite magnetic core cracking molding die and its working method - Google Patents

Anti- ET and RT class magnetic ferrite magnetic core cracking molding die and its working method Download PDF

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Publication number
CN109016090A
CN109016090A CN201810935667.9A CN201810935667A CN109016090A CN 109016090 A CN109016090 A CN 109016090A CN 201810935667 A CN201810935667 A CN 201810935667A CN 109016090 A CN109016090 A CN 109016090A
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cavity plate
upper mold
interior
magnetic core
class
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CN201810935667.9A
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CN109016090B (en
Inventor
王开旺
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Hengdian Group DMEGC Magnetics Co Ltd
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Hengdian Group DMEGC Magnetics Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/02—Moulds with adjustable parts specially for modifying at will the dimensions or form of the moulded article

Abstract

The invention discloses anti-ET and RT class magnetic ferrite magnetic core cracking molding dies; including upper mold, cavity plate and lower die; upper mold is adapted to the matrix cavity on cavity plate; upper mold is connect with a upper mold axial actuating mechanism; cavity plate is connect with a cavity plate axial actuating mechanism, this molding die further includes interior upper mold and interior cavity plate, and interior upper mold is slidably connected in upper mold; interior cavity plate is slidably connected in cavity plate, and interior cavity plate is slidably socketed in lower die.The invention also discloses the working methods of the anti-ET and RT class magnetic ferrite magnetic core cracking molding die.The present invention can carry out finer pressing process control to the key position of ET and RT class magnetic ferrite magnetic core, green density distribution after molding is set to tend to be uniform, the density parting line of green compact is far from wall leg, pilaster intersection, to generate a possibility that cracking because contraction is irregular when reducing sintering.

Description

Anti- ET and RT class magnetic ferrite magnetic core cracking molding die and its working method
Technical field
The present invention relates to the working methods of a kind of magnetic product processing mold and the mold, more specifically, it relates to anti-ET And RT class magnetic ferrite magnetic core cracking molding die and its working method.
Background technique
ER, ET class magnetic ferrite magnetic core are usually in class E font, by wall portion 8, center pillar 9 and a pair of 10 structure of symmetrical side leg At as shown in Figure 1.ER, ET class magnetic ferrite magnetic core can generate some quality defects in the fabrication process, common for wall leg Place's crackle and wall portion transversal crack are passed through in the friendship place of passing through crackle, pilaster friendship, as shown in Figure 2.This quality defect industry is generally existing, and Feasible solution and technology there is no to issue at present.
What crack defect generated will form green compact because of magnet there are density contrast, during the sintering process shrinkage degree it is different and It is caused.Studies have shown that the density of ER, ET class soft ferrite magnetic core products center pillar and side leg is successively decreased from below to up, with wall portion Junction density is minimum, and the density of wall portion is excessively high, and in sintering, the contraction of center pillar and side leg is greater than the contraction of wall portion, is easy to produce Raw junction tearing hands over the place of passing through, pilaster friendship to pass through place's crackle to generate wall leg；Wall portion transversal crack is then the compact density of wall portion It is excessively high, cracking caused by the effect of the elastic after effect of compacting.
It is because existing forming technique limitation causes that green compact, which is formed, there are density contrast, and the magnetic core of ER, ET class contains one Or multiple steps, the mold of existing cavity plate integral structure and common one-way or bi-directional compression moulding mode can not all overcome as The upper quality defect.Therefore, existing ET and RT class mould for molding magnetic core of soft ferrite and its working method require to change Into to seek the solution of the upper quality problem.
Summary of the invention
It is soft that existing ET and RT class mould for molding magnetic core of soft ferrite and its working method can not effectively solve ER, ET class Magnetic ferrites magnetic core generates wall leg in the fabrication process and hands over the place's of passing through crackle, pilaster that the place's of passing through crackle and wall portion transversal crack etc. is handed over to ask Topic tends to uniformly, keep the density parting line of green compact remote the present invention provides the distribution of achievable green density in order to overcome these deficiencies Place is passed through from wall leg intersection, pilaster friendship, and effectively weakens the elastic after effect of green compact, to be produced when reducing sintering because contraction is irregular The anti-ET and RT class magnetic ferrite magnetic core cracking molding die and its working method of raw possibility of cracks.
The molding die the technical scheme is that anti-ET and RT class magnetic ferrite magnetic core cracks, including upper mold, cavity plate And lower die, upper mold are adapted to the matrix cavity on cavity plate, upper mold is connect with a upper mold axial actuating mechanism, and cavity plate and a cavity plate are axial Driving mechanism connection, this molding die further includes interior upper mold and interior cavity plate, and interior upper mold is slidably connected in upper mold, interior cavity plate sliding It is connected in cavity plate, interior cavity plate is slidably socketed in lower die.The present invention is to ET and RT class soft magnetic ferrite magnetic in the prior art Core molding die improves, and the upper mold of original integral structure and cavity plate are changed to two segment structure of upper mold and two sections of cavity plate knots The pressing process of structure, the improvement of connecting shaping mold, ET and RT class magnetic ferrite magnetic core also changes correspondingly, and generates and is different from now There is the compaction curve of molding die.This molding die can carry out the key position of ET and RT class magnetic ferrite magnetic core finer Pressing process control, tend to green density after molding distribution uniformly, the density parting line of green compact is handed over far from wall leg, pilaster At boundary, and effectively weaken the elastic after effect of green compact, to generate a possibility that cracking because contraction is irregular when reducing sintering.
Preferably, upper mold, interior upper mold, cavity plate, interior cavity plate and lower die are coaxial.It can better ensure that ET and RT class is soft in this way Power transmitting is accurate during magnetic ferrites magnetic core compression moulding, and mechanical structure is balanced, and green density after molding is made to be evenly distributed.
Preferably, the upper mold axial actuating mechanism and cavity plate axial actuating mechanism are hydraulic drive mechanism.This molding As power, inertia is small using hydraulic for the open mold of mold, and stable drive, strength is big, and mechanism is simple.
As an alternative, the upper mold axial actuating mechanism and cavity plate axial actuating mechanism are motor-driven mechanism.This molding The open mold of mold is sensitive using motor as power, and control is accurate.
The working method of anti-ET and RT class magnetic ferrite magnetic core cracking molding die, comprising the following steps:
A. fill: upper mold is run to press upper dead center position, and position on the basis of lower die is fixed, cavity plate and interior cavity plate are transported from de-molding position Filling position is moved, cavity plate is relative to the mobile total filling stroke L of lower die, and interior cavity plate is relative to the mobile rank of cavity plate filling stroke h deeply, upper mold Relative to the mobile flash stroke distances K of interior upper mold, magnet powder is filled in the cavity that cavity plate, interior cavity plate and lower die are formed；
B. mold: cavity plate, interior cavity plate keep filling position, interior upper mold and upper mold holding relative position move downward, when upper mold into Enter cavity plate and completes molding；
C. flash: on position when cavity plate is maintained at filling, interior upper mold keeps relative position to continue traveling downwardly with upper mold and interior cavity plate, Magnet powder is squeezed into and is full of the space that interior upper mold and upper mold are formed；
D. lower pressurization: interior upper mold, upper mold, cavity plate, interior cavity plate keep relative position to synchronize continuing traveling downwardly, magnet powder inside on The sealed mould that mould, upper mold, cavity plate, interior cavity plate and lower die enclose is intracavitary to be gradually compacted, because upper mold, outer upper mold, cavity plate, interior Cavity plate is to maintain relative position and DL synchronization, according to relative motion principle, if using interior cavity plate as object of reference, lower die It lifts powder to move upwards, applies pressure from the bottom to top to powder, lower pressurization can be referred to as；It is run to cavity plate, interior cavity plate Mechanical stop, lower pressure process are completed, and lower die is relative to the mobile lower pressure stroke s of cavity plate；
E. upper pressurization: cavity plate, interior cavity plate meet mechanical stop and static, and interior upper mold, upper mold, which continue traveling downwardly, runs to the lower dead of press Point, interior upper mold is relative to the mobile upper pressure stroke f of upper mold；
F. protection demoulding: stripping action sequence be cavity plate come downwards to magnet powder pressing at green compact rank depth bottom, then cavity plate Relative position DL synchronization is kept with interior cavity plate；Interior upper mold keeps pressure to act on green compact during demoulding, to overcome pressure The elastic after effect bring of base cracks, and eliminates ejection resistance and cause the deep damaged factor of rank, effectively eliminates wall portion transversal crack.
G. demoulding discharge: green compact is deviate from from cavity plate completely, upper mold backhaul to top dead-centre, green compact be fed device release or by Manipulator takes out, and a compacting circulation terminates.
Above step, the design feature based on this molding die and be unfolded, can be to ET and RT class magnetic ferrite magnetic core Key position carries out finer pressing process control, tends to green density distribution after molding uniformly, the density point of green compact Molded line generates the possibility to crack because contraction is irregular when wall portion transversal crack is to reduce sintering far from wall leg, pilaster intersection Property.
Preferably, from the magnet powder of filling to the green compact of compression moulding, the height of green compact and the magnet powder of filling For height than being δ, δ value range is 1.8~2.3.δ value range is limited to 1.8~2.3, realizes that difficulty is moderate, with existing hard Part configuration and power supply can reach.
Preferably, the value range that the powder hole system of magnet powder leads is 25%~30%.It is reflection magnetic that powder hole system, which leads, One of the parameter of body powder quality, powder hole system lead control and are both easy to reach green compact molding matter in 25%~30% magnet powder Amount, and moderate cost.
The beneficial effects of the present invention are:
Problem of Cracking after sintering effectively in solution ET and RT class magnetic ferrite magnetic core production process.The present invention can be to ET and RT The key position of class magnetic ferrite magnetic core carries out finer pressing process control, tends to green density distribution after molding Uniformly, the density parting line of green compact is far from wall leg, pilaster intersection, and effectively weakens the elastic after effect of green compact, to reduce burning A possibility that cracking is generated because contraction is irregular when knot.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of ET and RT class magnetic ferrite magnetic core；
Fig. 2 is the position view of crackle after the sintering of ET and RT class magnetic ferrite magnetic core；
Fig. 3 is a kind of structural schematic diagram of the invention；
Fig. 4 is motion state schematic diagram of the invention in each step of ET and RT class soft magnetic ferrite magnetic core forming process；
Fig. 5 is the green density distribution situation that forming experiment acquisition is carried out using the present invention.
In figure, 1- upper mold, upper mold in 2-, 3- cavity plate, cavity plate in 4-, 5- lower die, 6- magnet powder, 7- green compact, 8- wall portion, 9- center pillar, the side 10- leg, H- green compact is always high, and j- green compact rank is deep, and L- always fills stroke, and h- rank fills deeply, K- flash stroke, on f- Pressure stroke, pressure stroke under s-.
Specific embodiment
The invention will be further described for specific embodiment with reference to the accompanying drawing.
Embodiment 1:
The molding die as shown in figure 3, anti-ET and RT class magnetic ferrite magnetic core cracks, including upper mold 1, cavity plate 3 and lower die 5, on Mould 1 is adapted to the matrix cavity on cavity plate 3, and upper mold 1 is connect with a upper mold axial actuating mechanism, and cavity plate 3 and a cavity plate are axially driving Mechanism connection, this molding die further includes interior upper mold 2 and interior cavity plate 4, and interior upper mold 2 is slidably connected in upper mold 1, and interior cavity plate 4 is sliding Dynamic to be connected in cavity plate 3, interior cavity plate 4 is slidably socketed in lower die 5.Upper mold 1, interior upper mold 2,4 cavity plates 3, interior cavity plate 4 and lower die 5 Coaxially.This molding die is mounted on hydraulic press, and the upper mold axial actuating mechanism and cavity plate axial actuating mechanism are hydraulic Driving mechanism.
The working method of the described anti-ET and RT class magnetic ferrite magnetic core cracking molding die, as shown in figure 4, include with Lower step:
A. fill: the operation of upper mold 1 is to press upper dead center position, position on the basis of lower die 5 is fixed, and cavity plate 3 and interior cavity plate 4 are from demoulding position It sets and moves to filling position, cavity plate 3 is relative to the mobile total filling stroke L of lower die 5, and interior cavity plate 4 is relative to the mobile rank of cavity plate 3 filling row deeply Journey h, the mobile flash stroke distances K of the upper mold 2 in of upper mold 1, fills in the cavity that cavity plate 3, interior cavity plate 4 and lower die 5 are formed Magnet powder 6；
B. mold: cavity plate 3, interior cavity plate 4 keep filling position, and interior upper mold 2 keeps relative position to move downward with upper mold 1, when upper Mould 1 enters cavity plate 3 and completes molding；
C. flash: on position when cavity plate 3 is maintained at filling, interior upper mold 2 keeps relative position to continue with upper mold 1 and interior cavity plate 4 Downlink, the space that magnet powder 6 is squeezed into and is formed full of interior upper mold 2 with upper mold 1；
D. lower pressurization: interior upper mold 2, upper mold 1, cavity plate 3, the holding of interior cavity plate 4 relative position synchronize and continue traveling downwardly, and magnet powder 6 exists The sealed mould that interior upper mold 2, upper mold 1, cavity plate 3, interior cavity plate 4 and lower die 5 enclose is intracavitary to be gradually compacted, to cavity plate 3, interior cavity plate 4 run to mechanical stop, and lower pressure process is completed, and lower die 5 is relative to the mobile lower pressure stroke s of cavity plate 3；
E. upper pressurization: cavity plate 3, interior cavity plate 4 meet mechanical stop and static, and interior upper mold 2, upper mold 1 continue traveling downwardly and run to press Bottom dead centre position, interior upper mold 2 is relative to the mobile upper pressure stroke f of upper mold 1；
F. protection demoulding: stripping action sequence is the 7 rank depth bottom of green compact that cavity plate 3 comes downwards to that magnet powder 6 is pressed into, then recessed Mould 3 and interior cavity plate 4 keep relative position DL synchronization；Interior upper mold 2 keeps pressure to act on green compact 7 during demoulding, with Overcome the elastic after effect bring of green compact to crack, and eliminate ejection resistance and cause the deep damaged factor of rank, effectively eliminates wall portion cross To crackle.
G. demoulding discharge: green compact 7 is deviate from from cavity plate 3 completely, 1 backhaul of upper mold to top dead-centre, and green compact 7 is fed device release Or taken out by manipulator, a compacting circulation terminates.
From the magnet powder 6 of filling to the green compact 7 of compression moulding, the height of green compact 7 and the 6 height ratio of magnet powder of filling 1.8 are taken for δ, δ.It is 25% that the powder hole system of magnet powder 6, which leads ζ value,.
Compaction curve meets following functional relation:
L=H* δ, h=j* δ, f=L* (1- ζ)/2, s=L-f, K=f-h/2.
Forming experiment is carried out according to technical solution provided by the invention, green compact 7 is intercepted into six sections of test densitys, in Fig. 5 It is the parting line of green density at the 4th section shown in data, parting line two sides density is gradually incremented by towards upper and lower two direction respectively, i.e., The parting line of green compact is passed through by the friendship of original column leg and is moved down at the 4th section of diagram, is effectively overcome sintering shown in Fig. 2 and is generated The phenomenon that crackle.
Embodiment 2:
This molding die is mounted on electric pressing machine, and the upper mold axial actuating mechanism and cavity plate axial actuating mechanism are motor drive Motivation structure.δ value is 2.0.The value range that the powder hole system of magnet powder 6 leads ζ is 27%.Remaining is the same as embodiment 1.
Embodiment 2:
δ value is 2.3.The value range that the powder hole system of magnet powder 6 leads ζ is 30%.Remaining is the same as embodiment 1.

Claims (7)

  1. The molding die 1. anti-ET and RT class magnetic ferrite magnetic core cracks, including upper mold (1), cavity plate (3) and lower die (5), upper mold (1) it is adapted to the matrix cavity on cavity plate (3), upper mold (1) is connect with a upper mold axial actuating mechanism, cavity plate (3) and a cavity plate axis It is connected to driving mechanism, it is characterized in that further including interior upper mold (2) and interior cavity plate (4), interior upper mold (2) is slidably connected at upper mold (1) Interior, interior cavity plate (4) is slidably connected in cavity plate (3), and interior cavity plate (4) is slidably socketed on lower die (5).
  2. The molding die 2. anti-ET and RT class magnetic ferrite magnetic core according to claim 1 cracks, it is characterized in that upper mold (1), interior upper mold (2), cavity plate (3), interior cavity plate (4) and lower die (5) are coaxial.
  3. The molding die 3. anti-ET and RT class magnetic ferrite magnetic core according to claim 1 or 2 cracks, it is characterized in that described Upper mold axial actuating mechanism and cavity plate axial actuating mechanism are hydraulic drive mechanism.
  4. The molding die 4. anti-ET and RT class magnetic ferrite magnetic core according to claim 1 or 2 cracks, it is characterized in that described Upper mold axial actuating mechanism and cavity plate axial actuating mechanism are motor-driven mechanism.
  5. 5. the working method of anti-ET and RT class magnetic ferrite magnetic core cracking molding die described in claim 1, it is characterized in that The following steps are included:
    A. fill: upper mold (1) is run to press upper dead center position, position on the basis of lower die (5) is fixed, cavity plate (3) and interior cavity plate (4) Filling position is moved to from de-molding position, cavity plate (3) is relative to lower die (5) mobile total filling stroke L, and interior cavity plate (4) is with respect to cavity plate (3) mobile rank filling stroke h deeply, the mobile flash stroke distances K of upper mold (1) upper mold (2) in, in cavity plate (3), interior cavity plate (4) and in the cavity of lower die (5) formation magnet powder (6) are filled；
    B. mold: cavity plate (3), interior cavity plate (4) keep filling position, and interior upper mold (2) keeps relative position to transport downwards with upper mold (1) It is dynamic, molding is completed when upper mold (1) enters cavity plate (3)；
    C. flash: on position when cavity plate (3) is maintained at filling, interior upper mold (2) and upper mold (1) and interior cavity plate (4) keep opposite Position continues traveling downwardly, the space that magnet powder (6) is squeezed into and is formed full of interior upper mold (2) and upper mold (1)；
    D. lower pressurization: interior upper mold (2), upper mold (1), cavity plate (3), interior cavity plate (4) holding relative position synchronize and continue traveling downwardly, magnet Powder (6) the sealed mould that interior upper mold (2), upper mold (1), cavity plate (3), interior cavity plate (4) and lower die (5) enclose it is intracavitary gradually by Compacting runs to mechanical stop to cavity plate (3), interior cavity plate (4), and lower pressure process is completed, and lower die (5) is mobile relative to cavity plate (3) Lower pressure stroke s；
    E. upper pressurization: cavity plate (3), interior cavity plate (4) meet mechanical stop and static, and interior upper mold (2), upper mold (1) continue traveling downwardly operation To the bottom dead centre position of press, interior upper mold (2) pressure stroke f in upper mold (1) movement；
    F. protection demoulding: stripping action sequence is green compact (7) rank depth bottom that cavity plate (3) comes downwards to that magnet powder (6) is pressed into, Then cavity plate (3) and interior cavity plate (4) keep relative position DL synchronization；Interior upper mold (2) keeps pressure effect during demoulding On green compact (7)；
    G. demoulding discharge: abjection, upper mold (1) backhaul to top dead-centre, green compact (7) are fed device to green compact (7) completely from cavity plate (3) It releases or is taken out by manipulator, a compacting circulation terminates.
  6. 6. the working method of anti-ET and RT class magnetic ferrite magnetic core cracking molding die according to claim 5, special Sign is from the magnet powder (6) of filling to the green compact (7) of compression moulding, and the height of green compact (7) and the magnet powder (6) of filling are high For degree than being δ, δ value range is 1.8~2.3.
  7. 7. the working method of anti-ET and RT class magnetic ferrite magnetic core cracking molding die according to claim 5 or 6, It is characterized in that the value range that the powder hole system of magnet powder (6) leads is 25%~30%.
CN201810935667.9A 2018-08-16 2018-08-16 Forming die for preventing ET and RT soft magnetic ferrite magnetic cores from cracking and working method thereof Active CN109016090B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111138072A (en) * 2019-12-30 2020-05-12 西安赛尔电子材料科技有限公司 Forming die for forming circular porous glass blank

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07278607A (en) * 1994-04-14 1995-10-24 Nippon Steel Corp Powder molding method using segmental die
JPH10128723A (en) * 1996-11-01 1998-05-19 Nissho:Kk Mold for molding tile
CN203292482U (en) * 2013-03-12 2013-11-20 标旗磁电产品(佛冈)有限公司 Powder metallurgy pressing die capable of removing burrs
CN103706787A (en) * 2012-09-30 2014-04-09 自贡硬质合金有限责任公司 Die and automatic forming press and forming method thereof
CN204247956U (en) * 2014-11-19 2015-04-08 横店集团东磁股份有限公司 The demolding structure that a kind of core is synchronous
CN106378958A (en) * 2016-12-06 2017-02-08 重庆江东机械有限责任公司 Die with floating pressure compensation mechanism and working process of die
CN206253648U (en) * 2016-11-24 2017-06-16 上海平野磁气有限公司 A kind of pressure setting of full-automatic magnetic powder molding press

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07278607A (en) * 1994-04-14 1995-10-24 Nippon Steel Corp Powder molding method using segmental die
JPH10128723A (en) * 1996-11-01 1998-05-19 Nissho:Kk Mold for molding tile
CN103706787A (en) * 2012-09-30 2014-04-09 自贡硬质合金有限责任公司 Die and automatic forming press and forming method thereof
CN203292482U (en) * 2013-03-12 2013-11-20 标旗磁电产品(佛冈)有限公司 Powder metallurgy pressing die capable of removing burrs
CN204247956U (en) * 2014-11-19 2015-04-08 横店集团东磁股份有限公司 The demolding structure that a kind of core is synchronous
CN206253648U (en) * 2016-11-24 2017-06-16 上海平野磁气有限公司 A kind of pressure setting of full-automatic magnetic powder molding press
CN106378958A (en) * 2016-12-06 2017-02-08 重庆江东机械有限责任公司 Die with floating pressure compensation mechanism and working process of die

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111138072A (en) * 2019-12-30 2020-05-12 西安赛尔电子材料科技有限公司 Forming die for forming circular porous glass blank
CN111138072B (en) * 2019-12-30 2022-05-20 西安赛尔电子材料科技有限公司 Forming die for forming circular porous glass blank

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Denomination of invention: Mold and its working method for preventing ET and RT soft ferrite core from cracking

Effective date of registration: 20221111

Granted publication date: 20200320

Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd.

Pledgor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd.

Registration number: Y2022330003034