CN202278640U - Ferrite permanent magnet tile upper die with novel drainage structure - Google Patents
Ferrite permanent magnet tile upper die with novel drainage structure Download PDFInfo
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- CN202278640U CN202278640U CN2011204027274U CN201120402727U CN202278640U CN 202278640 U CN202278640 U CN 202278640U CN 2011204027274 U CN2011204027274 U CN 2011204027274U CN 201120402727 U CN201120402727 U CN 201120402727U CN 202278640 U CN202278640 U CN 202278640U
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- patrix
- osculum
- row
- working face
- curved working
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Abstract
The utility model relates to a ferrite permanent magnet tile upper die with a novel drainage structure. The upper die is characterized in that drain holes of the upper die are distributed in a butterfly shape, so that the density of all parts of a ferrite permanent magnet tile body are approximately consistent during the forming process; drain holes are densely distributed in a section I corresponding to both sides of drain holes in each die cavity; in a section II, drain holes in every two adjacent lines are distributed in a staggered mode, and no drain hole is arranged on both sides of a central line so as to overcome the shortages caused by the structure of an arc green body that the pressure acting on the arc top to two sides of the arc body is gradually reduced and the extrusion drainage speed is also gradually reduced in the pressing process, restrain the drainage speed of the middle part of the arc green body, and accelerate the drainage speed of side parts, so that the density of all parts of the green body are approximately consistent, thereby improving the quality of the green body, reducing sintering deformation so as to achieve the purpose of reducing the preset thickness of the green body, and reducing the forming difficulty and the grinding allowance of post-grinding processing.
Description
Technical field
The utility model relates to permanent ferrite magnetic tile die production technical field, is specifically related to a kind of magnetic shoe upper mould of novel discharge structure.
Background technology
The permanent ferrite magnetic tile moulding divides dry-pressing formed and Wet-pressing molding.Dry-pressing formed used material powder (SrFeO) water content little (water content is usually below 3%) does not need draining during moulding, yield rate is easy to control, and institute's properties of product of doing are not high; The used material powder degree of Wet-pressing molding is the 0.7-1.1 micron, and contains 35%-40% moisture (being commonly called as slip).Slip injects the mould die cavity during moulding, and slip is because moisture is big, and good fluidity helps magnetic powder particle and under the effect of magnetic field, moves upset, directional orientation.The base substrate magnetic domain arranging rule of moulding, anisotropy is big, and magnetic property is high.Disadvantageous when being moulding in the base substrate moisture entrapment too much or each position residual moisture of base substrate inhomogeneous, can directly influence the quality of base substrate.
Because the magnetic shoe product is curved, mould also need be made into arc, and during hydraulic press compression moulding, the point of application affacts on the base substrate along arcwall face.Through force analysis, can know that press separates minimum through the pressure that mould is delivered on the base substrate in arc top punishment, the power that acts on the base substrate is big; And far away more to two avris from the arc top, force resolution is big more, and the power that acts on the base substrate is more little.So in the identical press time, big near arc top bit extruding force in the middle of the base substrate, moisture is discharged fast; Far away more to two avris respectively from arc top, extruding force is more little, and the speed that moisture is discharged is slow more, in the promptly same pressing cycle, base substrate from the arc top to the both sides water discharge trend that tapers off.The base substrate of compression moulding is little near the middle part water content on arc top like this, the big (3.5-3.8g/cm of blank density
3); Side, both sides water content is big, the little (2.5-2.8g/cm of blank density
3).Because each position density of base substrate has big difference, the middle part is high to vertical crack because of overvoltage produces along axle, two avris because of under-voltage generation along cambered surface to transverse crack, especially bend tall and bigly, the product that thickness is thick partially shows more obviously.When high temperature sintering, each position difference in shrinkage can increase, and produces bigger stress, causes ripe base to crack, the product bad mechanical strength; And because of the base substrate water content uneven, sintering shrink base substrate vertically, arc is to all producing the deflection that surpasses theoretical value, needing to lean on increases the molding blank design thickness and guarantee that the mill processing of road, back do not leak mill, has increased the moulding difficulty and has ground allowance.
Present known magnetic shoe mould discharge structure is along the slot type draining patrix and the matrix distribution cellular type draining patrix (see figure 4) of arcuate directions.Because magnetic shoe is curved, the molding blank stress point is the characteristics of curved distribution also, the base substrate unbalance stress that causes, and with the base substrate of said structure patrix compression moulding, the density of its arc top near zone is than the big 1g/cm of density of two avris
3More than, bring more serious defective to base substrate.
The utility model content
The purpose of the utility model is: provide a kind of satisfy make mould base substrate arc top near zone draining when moulding slow, gradually fast to two avris drainings, dwindle the cellular type draining patrix that butterfly distributes that is of each position density variation of base substrate.
The technical scheme that the utility model adopted is:
The permanent ferrite magnetic tile patrix of novel discharge structure, mould body is provided with plural patrix curved working face on the said permanent ferrite magnetic tile, and the supreme mould body end face of each patrix curved working face is provided with the osculum of vertical perforation; Patrix curved working face chord length width is 2L, and patrix curved working face axial length is M, it is characterized in that: said osculum is symmetrical distribution at each patrix curved working face, and the distribution of a side osculum is following,
Be provided with in the I district of center line far-end more than two row is 3.5mm, D with row centre-to-centre spacing
1Patrix osculum A for Φ 2.5mm; The quantity n of the patrix of every row---osculum A is [Mmm/3.5mm], and [x] is bracket function;
Be provided with in the II district of center line near-end more than two row is 5mm, D with row centre-to-centre spacing
2Patrix osculum B for Φ 2.2mm;
The said II district every row of the internal drainage hole B ecto-entad patrix osculum B that successively decreases, and patrix osculum B is dislocatedly distributed between every adjacent columns; The quantity of the patrix osculum B of its initial row is [n/2], and the quantity of the patrix osculum B of its terminal column is 2.
The width in the I district of said patrix curved working face is L/4.
The width in the II district of said patrix curved working face is L * 7/12.
The useful technique effect of the utility model is: the osculum of upper mould distributes, and sees that from the top down the distribution of its vertical view osculum of each die cavity is butterfly shape, and each row drainage area is (when n is even number) n π (D in the two avris I sections
1/ 2)
2The first row drainage area is (n/2) π (D in the II section
2/ 2)
2, the secondary series drainage area is (n/2-1) π (D
2/ 2)
2... When being odd number (in like manner can extrapolate n drainage area); Osculum is not beaten in the center line both sides, and the extruding of moisture depended on pressure is discharged beyond the die cavity or is expressed in the osculum in the II section and discharges.Such butterfly osculum distributes; Suppressed the drainage speed of middle part, base substrate arc top, accelerated the drainage speed at avris position, to pass to place, base substrate arc top extruding force big to remedy press; It is big to pass to the base substrate arc top zone line density that base substrate two avris place extruding forces cause for a short time; The deficiency that avris density is little detects through test, and above-mentioned its density contrast of mould pressed green body is from 1g/cm
3More than, be reduced to 0.2-0.4g/cm
3Between.Intensification when having reduced blank sintering bursts and cooling bursts.Especially bend tall and bigly, the product effect that thickness is thick partially is obvious, and can reduce green compact and set thickness because of reducing sintering warpage, has reduced the grinding allowance of moulding difficulty and the mill processing of road, back.
Description of drawings
Fig. 1 is the utility model structural representation (n is an odd number).
Fig. 2 is the utility model structural representation (n is an even number).
Fig. 3 is the elevation cross-sectional view of the utility model.
Fig. 4 is existing matrix distribution cellular type draining patrix structure chart.
Among the figure: 1 patrix osculum A, 2 patrix osculum B.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is done explanation further through embodiment.
Embodiment 1:
The permanent ferrite magnetic tile patrix of novel discharge structure, mould body is provided with six patrix curved working faces on the said permanent ferrite magnetic tile, and the supreme mould body end face of each patrix curved working face is provided with the osculum of vertical perforation; Patrix curved working face chord length width is 2L, and patrix curved working face axial length is 55mm, and improvement is: said osculum is symmetrical distribution (being butterfly shape) at each patrix curved working face, and the distribution of a side osculum is following, (referring to Fig. 1)
What be provided with four row in the I district of center line far-end is that centre-to-centre spacing is gathered, D with 3.5mm * 3.5mm
1The patrix osculum A1 of=Φ 2.5mm; The quantity n of the patrix of every row---osculum A1 is 15.
What be provided with six row in the II district of center line near-end is 5mm, D with row centre-to-centre spacing
2Patrix osculum B2 for Φ 2.2mm;
The said II district every row of the internal drainage hole B2 ecto-entad patrix osculum B2 that successively decreases, and patrix osculum B2 is dislocatedly distributed between every adjacent columns; The quantity of the patrix osculum B2 of its initial row is 7, and the quantity of the patrix osculum B of its terminal column is 2.
The width in the I district of said patrix curved working face is L/4.
The width in the II district of said patrix curved working face is L * 7/12.
Embodiment 2:
Referring to Fig. 2; Patrix curved working face length is 2L, and patrix curved working face width is 50mm, the patrix of every row--the quantity n of-osculum A1 is 14; The quantity of the patrix osculum B2 of the initial row of said II district internal drainage hole B is 7, and the quantity of the patrix osculum B of its terminal column is 2.
Other are with embodiment 1.---
Claims (3)
1. the permanent ferrite magnetic tile patrix of novel discharge structure, mould body is provided with plural patrix curved working face on the said permanent ferrite magnetic tile, and the supreme mould body end face of each patrix curved working face is provided with the osculum of vertical perforation; Patrix curved working face chord length width is 2L, and patrix curved working face axial length is M, it is characterized in that: said osculum is symmetrical distribution at each patrix curved working face, and the distribution of a side osculum is following,
Be provided with in the I district of center line far-end more than two row is 3.5mm, D with row centre-to-centre spacing
1Patrix osculum A for Φ 2.5mm; The quantity n of the patrix of every row---osculum A is [Mmm/3.5mm], and [x] is bracket function;
Be provided with in the II district of center line near-end more than two row is 5mm, D with row centre-to-centre spacing
2Patrix osculum B for Φ 2.2mm;
The said II district every row of the internal drainage hole B ecto-entad patrix osculum B that successively decreases, and patrix osculum B is dislocatedly distributed between every adjacent columns; The quantity of the patrix osculum B of its initial row is [n/2], and the quantity of the patrix osculum B of its terminal column is 2.
2. the permanent ferrite magnetic tile patrix of novel discharge structure according to claim 1, it is characterized in that: the width in the I district of said patrix curved working face is L/4.
3. the permanent ferrite magnetic tile patrix of novel discharge structure according to claim 1, it is characterized in that: the width in the II district of said patrix curved working face is L * 7/12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204027274U CN202278640U (en) | 2011-10-21 | 2011-10-21 | Ferrite permanent magnet tile upper die with novel drainage structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204027274U CN202278640U (en) | 2011-10-21 | 2011-10-21 | Ferrite permanent magnet tile upper die with novel drainage structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202278640U true CN202278640U (en) | 2012-06-20 |
Family
ID=46224822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204027274U Expired - Lifetime CN202278640U (en) | 2011-10-21 | 2011-10-21 | Ferrite permanent magnet tile upper die with novel drainage structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202278640U (en) |
-
2011
- 2011-10-21 CN CN2011204027274U patent/CN202278640U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120620 |