CN103846435B - A kind of composite die - Google Patents
A kind of composite die Download PDFInfo
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- CN103846435B CN103846435B CN201210524744.4A CN201210524744A CN103846435B CN 103846435 B CN103846435 B CN 103846435B CN 201210524744 A CN201210524744 A CN 201210524744A CN 103846435 B CN103846435 B CN 103846435B
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- die body
- die
- graphite material
- down head
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Abstract
A kind of composite die comprising die body and upper push-down head, it is characterised in that：The die body is integral structure, and the medial and lateral of die body and upper push-down head are made of different materials, and particularly, the outside of the die body and upper push-down head is permeability magnetic material, and inside is graphite material.Due to using high strength graphite, not only so that the service life of mold significantly improves, the molding qualification rate of permanent-magnet material blank product can also be improved, improves the surface accuracy and smoothness requirements of blank product, reduces pressing cost.
Description
Technical field
It is especially a kind of compound for being used in permanent-magnet material compression moulding process the present invention relates to a kind of composite die
Mold.
Background technology
In the production process for producing permanent-magnet material using powder metallurgical technique, the works such as powder-die mould-sintering processed are generally comprised
Sequence needs to put micro mist and obtains green compact product by magnetic field orientating compression moulding in a mold to obtain the permanent magnetism of product,
Molding die is for the Forming Quality of green compact product and the magnetic property important of final magnet in the process.
Perpendicular magnetic field orientation moulding press is generally used at present, i.e. magnetic field orientating direction and pressing direction is vertical, electromagnet
It is fixed on press operation platform, two groups of symmetrical distributions of coil, pressure head is in upper and lower position, and mold is installed on mould bases simultaneously
It is in close contact with left and right electromagnet cartridge.Usually by upper and lower pressure head, magnetic conductive board and side plate etc. are formed one set of die.
In compression moulding process, Magnaglo is orientated under the action of high-intensity magnetic field along direction of easy axis, therefore is wanted
It asks molding die to use permeability magnetic material in the orientation direction, and non-magnetic material can be used in other directions.Using traditional
Nonmagnetic steel（Such as 1Cr18Ni9Ti, 70Mn, 9Mn9）When making the molding die of Magnaglo, performance is poor, and hardness HRC is only
Have 34~47, service life is short, and the serious plucking of die wall after a period of use, and powder is glued in die cavity deformation, has seriously affected hair
The dimensional accuracy and surface quality of base, to increase the stock removal of follow-up blank product, greatly improve cost.
The patent application of CN20102051339.6 gives the method that cylinder molding die is uniformly directed field that improves, and passes through
Magnetic conduction item after embedded heat treatment（HRC values are 55）The wearability of hardness and die cavity is improved, part improves mold work
The hardness and wearability in region, however the patent is without inherently solving die cavity deformation, service life obviously shortens, green compact essence
Degree such as is remarkably decreased at a series of fundamental issues for being related to mold.CN201010207390.1 patent applications give a kind of neodymium
Rubber pattern equipped with NdFeB powder is placed in metal die and carries out orientation compacting again by the molding machine of iron boron material, this side
Method is to alignment magnetic field（That is electromagnet apparatus）And the packing density of powder proposes very high requirement, production efficiency is relatively low
Under；And the service life of rubber mold is shorter, while this method is also unfavorable for controlling the dimensional accuracy and surface matter of blank
Amount.
Invention content
The object of the present invention is to provide a kind of composite dies, use high strength graphite, not only so that the service life of mold
It significantly improves, the molding qualification rate of permanent-magnet material blank product can also be improved, improve the surface accuracy of blank product and bright and clean
Degree requires, and reduces pressing cost.
A kind of composite die comprising die body and upper push-down head, it is characterised in that：The die body is integral structure, mould
The medial and lateral of body and upper push-down head are made of different materials.
Preferably, the outside of the die body and upper push-down head is permeability magnetic material, and inside is graphite material.
Preferably, the thickness range of the die body and upper push-down head inside graphite material is 5~30mm.
Preferably, the range of friction coefficients of the graphite material and powder contact surface is 0.04~0.1.
Preferably, the finish ranging from ＞ 0.4 of the graphite material and powder contact surface.
Preferably, the coefficient of thermal expansion of the graphite material ranging from (0.5~3) x10-6K-1。
Preferably, the Moh's scale number of the graphite material ranging from 1~3.
Preferably, the range of friction coefficients of the die body mould intracavity wall is 0.04~0.1.
Preferably, the bright and clean angle value of the die body mould intracavity wall ranging from ＞ 0.4.
Preferably, the coefficient of thermal expansion of the die body mould intracavity wall ranging from (0.5~3) x10-6K-1, Moh's scale number model
Enclose is 1~3.
High strength graphite material is combined by the mold design of the present invention with permeability magnetic material, due to the coefficient of thermal expansion of graphite
It is small, and the intensity of graphite is reinforced with the raising of temperature, therefore mold deforms very small, the longevity of mold in pressing process
Life is dramatically increased；The dimensional accuracy of green compact product is effectively guaranteed simultaneously, saves the powder for suppressing same green compact
Materials.Since graphite has good self lubricity so that the friction in pressing process between powder and mould intracavity wall, pressure head
Power reduces, and is effectively guaranteed the smoothness requirements of green compact product, improves the surface quality of blank, the green compact product suppressed
The amount of double-side grinding reduces 30% or so after sintering.Magnetic circuit of the powder in die cavity can also be adjusted using graphite composite die
State improves magnetic field's regularity in mold, improves the magnetic declination of magnet, and then makes the magnetic property uniformity of blank product
Improve 10% or so.This high strength graphite composite die of the present invention ensure that mold using integral type die body simultaneously
Assembly precision and pressing process in precision, can significantly improve the ratio of briquetting of green compact product, prevent cracking layering etc.
The appearance of phenomenon.
Description of the drawings
Figure 1A is the die body structural schematic diagram of inventive die；
Figure 1B is the pressure head structure schematic diagram of inventive die；
Fig. 2A be the present invention can pressing block shape product mold die body schematic top plan view；
Fig. 2 B are the die body D-D cross-sectional views that the present invention can suppress shape product mold；
Fig. 2 C be the present invention can pressing block shape product mold pressure head structure schematic diagram；
Fig. 3 A are the die body schematic top plan views that the present invention can suppress cylindrical product mold；
Fig. 3 B are the die body D-D cross-sectional views that the present invention can suppress cylindrical product mold；
Fig. 3 C are the pressure head structure schematic diagrames that the present invention can suppress cylindrical product mold；
Fig. 4 A are the die body schematic top plan views that the present invention can suppress trapezoidal product mold；
Fig. 4 B are the die body D-D cross-sectional views that the present invention can suppress trapezoidal product mold；
Fig. 4 C are the pressure head structure schematic diagrames that the present invention can suppress trapezoidal product mold.
Specific implementation mode
The composite die of the present invention is made of die body and upper and lower die head, and wherein the structure of die body and previous detachable is not
Together, it is integral type, assembly cannot be dismantled, this structure makes the assembly of mold be easier, and is easier to ensure that the pressure of blank
Precision processed, as shown in Figure 1A.Refer to that side to form die cavity and be contacted with compacting powder, that corresponding side on the inside of die body
For outside.Integral type die body is made of the graphite material of the permeability magnetic material in outside and inside, while die body is through formula, in hair
Upper and lower pressure head is both needed to enter die cavity in base pressing process.The structure of upper and lower pressure head is as shown in Figure 1B, is contacted with compacting powder
That side be inside, that corresponding side be outside.Upper and lower pressure head is equally made of permeability magnetic material and graphite material, in
Side is graphite material.
The thickness range of graphite material of the present invention is 5~30mm, and range of friction coefficients is 0.04~0.1,
Coefficient of thermal expansion ranging from (0.5~3) * 10-6K-1, Moh's scale number range is 1~3, bright and clean angle value ranging from ＞ 0.4.Therefore
Graphite material, which is formed by mould intracavity wall and the graphite material layer surface of pressure head, all has above-mentioned identical performance parameter.
The composite die of the present invention can produce needs as needed and be adjusted, the variously-shaped production with size of compacting
Product, such as block shape product, cylindrical product, trapezoidal product and other shapes product.
The concrete structure of the composite die of the present invention is illustrated with reference to specific embodiment.
Magnetic powder materials ingredient used in following embodiment and comparative example, powder size size, pressing process etc. complete one
It causes, only the mold used in forming process is different.
Embodiment 1：
Fig. 2A, 2B, 2C are the structural schematic diagrams of the mold of pressing block shape product, and as shown in the figure 1 is die cavity, and 2 be graphite material
The bed of material, 3 be magnetic conductive material layer.Die body is made of the magnetic conductive material layer in outside and the graphite material of inside 5mm thickness, upper and lower to press
Head is also made of permeability magnetic material and graphite material, and the graphite material layer thickness contacted with compacting powder is also 5mm.Graphite material
The range of friction coefficients of layer is 0.04~0.1, coefficient of thermal expansion ranging from (0.5~3) * 10-6K-1, Moh's scale number range is 1
~3, bright and clean angle value ranging from ＞ 0.4.NdFeB micro mists are poured into the die cavity of mold, then carries out molding orientation, then upper,
Lower piece of shape product pressure head, which enters, carries out two-way compacting in die cavity, then demagnetize, seaming chuck backhaul, and push-down head ejects green compact demoulding.
Green compact is sintered after timeliness and obtains sintering blank（The blank six meets personally light size setting value and is after mill is processed
56x40x30mm）.The size and magnetic property of sintering blank are measured, data are shown in Table 1.Wherein Br uniformities refer to：It randomly selects
30 pieces of blank samples measure its Br value, the maximum value of measured Br and the range of minimum value.
Comparative example 1：
NdFeB micro mists are poured into the die cavity of geomery traditional moulds same as Example 1, then carries out molding and take
To then upper and lower block shape product pressure head, which enters, carries out two-way compacting in die cavity, then demagnetize, seaming chuck backhaul, push-down head ejection
Green compact demoulds.Green compact is sintered after timeliness and obtains sintering blank（The blank six meets personally light size setting value after mill is processed
For 56x40x30mm）.The size and magnetic property of sintering blank are measured, data are shown in Table 1.
Table 1
Embodiment 2：
Fig. 3 A, 3B, 3C are the structural schematic diagrams for the mold for suppressing cylindrical product, and as shown in the figure 1 is die cavity, and 2 be graphite
Material layer, 3 be magnetic conductive material layer.Die body is made of the magnetic conductive material layer in outside and the graphite material of inside 10mm thickness, above and below
Pressure head is also made of permeability magnetic material and graphite material, and the graphite material layer thickness contacted with compacting powder is also 10mm.Graphite
The range of friction coefficients of material layer is 0.04~0.1, coefficient of thermal expansion ranging from (0.5~3) * 10-6K-1, Moh's scale number model
It is 1~3 to enclose, bright and clean angle value ranging from ＞ 0.4.NdFeB micro mists are poured into the die cavity of mold, then carries out molding orientation, with
Upper and lower block shape product pressure head, which enters, afterwards carries out two-way compacting in die cavity, then demagnetize, seaming chuck backhaul, and push-down head ejects green compact
Demoulding.Green compact is sintered after timeliness and obtains sintering blank（The blank through mill process after light-exposed size setting value be
D18x32mm）.The size and magnetic property of sintering blank are measured, data are shown in Table 2.
Comparative example 2：
NdFeB micro mists are poured into the die cavity of geomery mold same as Example 2, then carry out molding orientation,
Then upper and lower block shape product pressure head, which enters, carries out two-way compacting in die cavity, then demagnetize, seaming chuck backhaul, push-down head ejection pressure
Base demoulds.Green compact is sintered after timeliness and obtains sintering blank（The blank through mill process after light-exposed size setting value be
D18x32mm）.The size and magnetic property of sintering blank are measured, data are shown in Table 2.
Table 2
Embodiment 3：
Fig. 4 A, 4B, 4C are the structural schematic diagrams for the mold for suppressing trapezoidal product, and as shown in the figure 1 is die cavity, and 2 be graphite material
The bed of material, 3 be magnetic conductive material layer.Die body is made of the magnetic conductive material layer in outside and the graphite material of inside 30mm thickness, upper and lower to press
Head is also made of permeability magnetic material and graphite material, and the graphite material layer thickness contacted with compacting powder is also 30mm.Graphite material
The range of friction coefficients of the bed of material is 0.04~0.1, coefficient of thermal expansion ranging from (0.5~3) * 10-6K-1, Moh's scale number range
It is 1~3, bright and clean angle value ranging from ＞ 0.4.NdFeB micro mists are poured into the die cavity of mold, then carries out molding orientation, then
Upper and lower block shape product pressure head, which enters, carries out two-way compacting in die cavity, then demagnetize, seaming chuck backhaul, it is de- that push-down head ejects green compact
Mould.Green compact is sintered after timeliness and obtains sintering blank（The blank through mill process after light-exposed size setting value be
70x44x32x18mm, 44mm are that the upper bottom of trapezoidal product is long, and 70mm is that the bottom of trapezoidal product is grown, and 32mm is trapezoidal product
Chord length, 18mm are the thickness of trapezoidal product）.The size and magnetic property of sintering blank are measured, data are shown in Table 3.
Comparative example 3：
NdFeB micro mists are poured into the die cavity of geomery mold same as Example 2, then carry out molding orientation,
Then upper and lower block shape product pressure head, which enters, carries out two-way compacting in die cavity, then demagnetize, seaming chuck backhaul, push-down head ejection pressure
Base demoulds.Green compact is sintered after timeliness and obtains sintering blank（The blank through mill process after light-exposed size setting value be
70x44x32x18mm）.The size and magnetic property of sintering blank are measured, data are shown in Table 3.
Table 3
Only it is several limited specific embodiments of the present invention above, it is each that composite die of the invention could be applicable to other
The product of kind shape.
Claims (4)
1. a kind of composite die comprising die body and upper push-down head, it is characterised in that：The die body is integral structure, die body
It is made of different materials with the medial and lateral of upper push-down head, the outside of the die body and upper push-down head is permeability magnetic material, and inside is stone
Ink material,
The thickness range of graphite material is 5~30mm on the inside of the die body and upper push-down head,
The range of friction coefficients of the graphite material and powder contact surface is 0.04~0.1,
The finish ranging from ＞ 0.4 of the graphite material and powder contact surface,
The coefficient of thermal expansion of the graphite material ranging from (0.5~3) × 10-6K-1,
The Moh's scale number of the graphite material ranging from 1~3.
2. a kind of composite die as described in claim 1, it is characterised in that：The range of friction coefficients of the die body mould intracavity wall
It is 0.04~0.1.
3. a kind of composite die as described in claim 1, it is characterised in that：The bright and clean angle value range of the die body mould intracavity wall
For ＞ 0.4.
4. a kind of composite die as described in claim 1, it is characterised in that：The coefficient of thermal expansion model of the die body mould intracavity wall
It encloses for (0.5~3) × 10-6K-1, Moh's scale number ranging from 1~3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210524744.4A CN103846435B (en) | 2012-12-07 | 2012-12-07 | A kind of composite die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210524744.4A CN103846435B (en) | 2012-12-07 | 2012-12-07 | A kind of composite die |
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| Publication Number | Publication Date |
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| CN103846435A CN103846435A (en) | 2014-06-11 |
| CN103846435B true CN103846435B (en) | 2018-09-18 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547775B (en) * | 2015-12-11 | 2019-01-22 | 平高集团有限公司 | Micro-crack defect standard test block manufacturing method and compacting tool set |
| CN106971800B (en) * | 2017-03-17 | 2019-02-15 | 京磁材料科技股份有限公司 | The green compact preparation method of Sintered NdFeB magnet |
| CN107492431A (en) * | 2017-08-09 | 2017-12-19 | 宁波永久磁业有限公司 | A kind of method for improving rare earth permanent magnet sintered NdFeB magnetic declination |
| JP6947625B2 (en) * | 2017-12-25 | 2021-10-13 | イビデン株式会社 | Manufacturing method of sintered magnet, graphite mold for hot press and graphite mold for hot press |
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| CN202963452U (en) * | 2012-12-07 | 2013-06-05 | 三环瓦克华（北京）磁性器件有限公司 | Composite die |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101850421B (en) * | 2010-06-23 | 2012-10-17 | 宁波永久磁业有限公司 | Molding device for NdFeB materials |
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| CN1471460A (en) * | 2001-10-02 | 2004-01-28 | ס�����������ʽ���� | Press apapratus and method for manufacturing magnet |
| WO2006046838A1 (en) * | 2004-10-28 | 2006-05-04 | Tesla Co., Ltd. | A manufacture method of ndfeb isotropic and anisotropic permanent magnets |
| CN1737955A (en) * | 2005-07-27 | 2006-02-22 | 北京工业大学 | Method for preparing rare-earth iron series biphase nanocrystalline composite permanent-magnet material |
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