CN103846435A - Combined mold - Google Patents
Combined mold Download PDFInfo
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- CN103846435A CN103846435A CN201210524744.4A CN201210524744A CN103846435A CN 103846435 A CN103846435 A CN 103846435A CN 201210524744 A CN201210524744 A CN 201210524744A CN 103846435 A CN103846435 A CN 103846435A
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Abstract
The invention discloses a combined mold which comprises a mold body, an upper pressing head and a lower pressing head, and is characterized in that the mold body adopts an integrated structure; the inner sides and the outer sides of the mold body, the upper pressing head and the lower pressing head are made of different materials; particularly, the outer sides of the mold body, the upper pressing head and the lower pressing head are made of a magnetism-conductive material, and the inner sides of the mold body, the upper pressing head and the lower pressing head are made of a graphite material. Due to the adoption of high-intensity graphite, the service life of the mold is obviously prolonged, and the forming qualification rate of a permanent magnet material blank product can be increased; the surface precision and the smoothness requirement of the blank product are improved, and the pressing cost is lowered.
Description
Technical field
The present invention relates to a kind of composite die, particularly a kind of composite die using for the compressing operation of permanent-magnet material.
Background technology
Produce in the production process of permanent-magnet material at employing powder metallurgical technique, generally comprise the operations such as powder process-die mould-sintering, for obtaining the permanent magnetism of product, micro mist need to be placed in mould by the compressing pressed compact product that obtains of magnetic field orientating, in this process, mould is for the magnetic property important of Forming Quality and the final magnet of pressed compact product.
Generally adopt at present perpendicular magnetic field orientation moulding press, be that magnetic field orientating direction is vertical with pressing direction, electromagnet is fixed on press operation platform, two groups of symmetrical distributions of coil, pressure head is in upper-lower position, mould be installed on mould bases and with left and right electromagnet cartridge close contact.One mold is conventionally by upper and lower pressure head, and the institutes such as magnetic conductive board and side plate form.
In compressing operation process, Magnaglo along direction of easy axis orientation, therefore requires mould in differently-oriented directivity, to adopt permeability magnetic material under the effect of high-intensity magnetic field, and can adopt non-magnetic material in other direction.In the time using traditional nonmagnetic steel (as 1Cr18Ni9Ti, 70Mn, 9Mn9 etc.) to make the mould of Magnaglo, its poor-performing, hardness HRC only has 34～47, service life is short, and the serious plucking of die wall after use a period of time, the sticky powder of die cavity distortion, has had a strong impact on dimensional accuracy and the surface quality of blank, thereby has strengthened the stock removal of follow-up blank product, improved cost greatly.
The patent application of CN20102051339.6 has provided and has improved the method that cylinder mould is evenly orientated, improve the wearability of hardness and die cavity by the magnetic conduction bar (HRC value is 55) after embedding heat treatment, the improvement of part hardness and the wearability in mold work region, but this patent does not obviously shorten from solving in essence die cavity distortion, service life, pressed compact precision significantly a series of fundamental issues that relate to mould of degradation.CN201010207390.1 patent application has provided a kind of shaped device of NdFeB material, the rubber pattern that NdFeB powder is housed is placed in and in metal die, is orientated compacting again, this method has proposed very high requirement to the packing density of alignment magnetic field (being electromagnet apparatus) and powder, and production efficiency is lower; And the service life of rubber mold is shorter, this method is also unfavorable for controlling dimensional accuracy and the surface quality of blank simultaneously.
Summary of the invention
The object of this invention is to provide a kind of composite die, it adopts high strength graphite, not only makes the life-span of mould significantly improve, and can also improve the moulding qualification rate of permanent-magnet material blank product, improve surface accuracy and the fineness requirement of blank product, reduced pressing cost.
A kind of composite die, it comprises die body and upper push-down head, it is characterized in that: described die body is integral structure, the medial and lateral of die body and upper push-down head are made up of different materials.
Preferably, the outside of described die body and upper push-down head is permeability magnetic material, and inner side is graphite material.
Preferably, inside described die body and upper push-down head, the thickness range of graphite material layer is 5～30mm.
Preferably, the range of friction coefficients of described graphite material layer and powder contact-making surface is 0.04～0.1.
Preferably, the fineness scope of described graphite material layer and powder contact-making surface is > 0.4.
Preferably, the thermal coefficient of expansion scope of described graphite material layer is (0.5～3) x10
-6k
-1.
Preferably, the Moh's scale number scope of described graphite material layer is 1～3.
Preferably, the range of friction coefficients of described die body mould intracavity wall is 0.04～0.1.
Preferably, the fineness value scope of described die body mould intracavity wall is > 0.4.
Preferably, the thermal coefficient of expansion scope of described die body mould intracavity wall is (0.5～3) x10
-6k
-1, Moh's scale number scope is 1～3.
Design of Dies of the present invention combines high strength graphite material with permeability magnetic material, because the thermal coefficient of expansion of graphite is little, and the intensity of graphite is strengthened along with the rising of temperature, therefore mould is out of shape very littlely in pressing process, and the life-span of mould is able to remarkable increase; The dimensional accuracy of pressed compact product is effectively guaranteed simultaneously, has saved the powder materials of suppressing same pressed compact.Because graphite has good self lubricity, the frictional force between powder and mould intracavity wall, pressure head in pressing process is reduced, effectively ensure the fineness requirement of pressed compact product, improved the surface quality of blank, after the pressed compact product sintering of suppressing, the amount of double-side grinding has reduced by 30% left and right.Adopt graphite composite die can also adjust the magnetic circuit state of powder in die cavity, improved the uniformity in magnetic field in mould, improved the magnetic declination of magnet, and then made the magnetic property uniformity of blank product improve 10% left and right.What simultaneously this high strength graphite composite die of the present invention adopted is integral type die body, has ensured the precision in assembly precision and the pressing process of mould, can improve significantly the ratio of briquetting of pressed compact product, the appearance of the phenomenons such as layering that prevent from ftractureing.
Brief description of the drawings
Figure 1A is the die body structural representation of mould of the present invention;
Figure 1B is the pressure head structure schematic diagram of mould of the present invention;
Fig. 2 A is the die body schematic top plan view that the present invention can pressing block shape product mold;
Fig. 2 B is the die body D-D cross-sectional view that the present invention can suppress shape product mold;
Fig. 2 C is the pressure head structure schematic diagram that the present invention can pressing block shape product mold;
Fig. 3 A is the die body schematic top plan view that the present invention can suppress cylindrical product mould;
Fig. 3 B is the die body D-D cross-sectional view that the present invention can suppress cylindrical product mould;
Fig. 3 C is the pressure head structure schematic diagram that the present invention can suppress cylindrical product mould;
Fig. 4 A is the die body schematic top plan view that the present invention can suppress trapezoidal product mold;
Fig. 4 B is the die body D-D cross-sectional view that the present invention can suppress trapezoidal product mold;
Fig. 4 C is the pressure head structure schematic diagram that the present invention can suppress trapezoidal product mold.
Detailed description of the invention
Composite die of the present invention is made up of die body and upper and lower die head, and wherein die body is different from the structure of detachable in the past, is integral type, can not dismantle assembled, this structure makes the assembling of mould easier, and more easily ensures the compacting precision of blank, as shown in Figure 1A.The inner side of die body refers to that side that forms die cavity and contact with compacting powder, and that corresponding side is outside.Integral type die body is made up of the permeability magnetic material in outside and the graphite material of inner side, and die body is penetration type simultaneously, and in blank pressing process, upper and lower pressure head all needs to enter die cavity.As shown in Figure 1B, it is inner side with that side that compacting powder contacts to the structure of upper and lower pressure head, and that corresponding side is outside.Upper and lower pressure head is made up of permeability magnetic material and graphite material equally, and its inner side is graphite material.
The thickness range of graphite material layer of the present invention is 5～30mm, and range of friction coefficients is 0.04～0.1, and thermal coefficient of expansion scope is (0.5～3) * 10
-6k
-1, Moh's scale number scope is 1～3, fineness value scope is > 0.4.The graphite material layer surface of the mould intracavity wall that therefore graphite material layer forms and pressure head all has above-mentioned identical performance parameter.
Composite die of the present invention as required need of production is adjusted, and suppresses the product of various shape and size, as piece shape product, cylindrical product, trapezoidal product and other shape products etc.
Below in conjunction with specific embodiment, the concrete structure of composite die of the present invention is described.
In following examples and comparative example, magnetic powder materials composition used, powder size size, pressing process etc. are in full accord, just mould difference used in forming process.
Embodiment 1:
Fig. 2 A, 2B, 2C are the structural representations of the mould of pressing block shape product, and 1 is die cavity as shown in the figure, and 2 is graphite material layer, and 3 is magnetic conductive material layer.Die body is made up of the magnetic conductive material layer in outside and the thick graphite material layer of inner side 5mm, and upper and lower pressure head is also made up of permeability magnetic material and graphite material, and its graphite material layer thickness contact with compacting powder is also 5mm.The range of friction coefficients of graphite material layer is 0.04～0.1, and thermal coefficient of expansion scope is (0.5～3) * 10
-6k
-1, Moh's scale number scope is 1～3, fineness value scope is > 0.4.NdFeB micro mist is poured in the die cavity of mould, then carried out matched moulds orientation, upper and lower shape product pressure head enters in die cavity and carries out two-way compacting subsequently, then demagnetization, and seaming chuck backhaul, push-down head ejects the pressed compact demoulding.Pressed compact is carried out obtaining after sintering timeliness sintering blank (this blank after mill processing six meet personally light size setting value be 56x40x30mm).Size and the magnetic property of measuring sintering blank, data are in table 1.Wherein Br uniformity refers to: randomly draw 30 blank sample in measurements its Br value, the maximum of measured Br and the scope of minimum of a value.
Comparative example 1:
NdFeB micro mist is poured in the die cavity of the traditional moulds that geomery is identical with embodiment 1, then carried out matched moulds orientation, upper and lower shape product pressure head enters in die cavity and carries out two-way compacting subsequently, then demagnetization, and seaming chuck backhaul, push-down head ejects the pressed compact demoulding.Pressed compact is carried out obtaining after sintering timeliness sintering blank (this blank after mill processing six meet personally light size setting value be 56x40x30mm).Size and the magnetic property of measuring sintering blank, data are in table 1.
Table 1
Embodiment 2:
Fig. 3 A, 3B, 3C are the structural representations of the mould of compacting cylindrical product, and 1 is die cavity as shown in the figure, and 2 is graphite material layer, and 3 is magnetic conductive material layer.Die body is made up of the magnetic conductive material layer in outside and the thick graphite material layer of inner side 10mm, and upper and lower pressure head is also made up of permeability magnetic material and graphite material, and its graphite material layer thickness contact with compacting powder is also 10mm.The range of friction coefficients of graphite material layer is 0.04～0.1, and thermal coefficient of expansion scope is (0.5～3) * 10
-6k
-1, Moh's scale number scope is 1～3, fineness value scope is > 0.4.NdFeB micro mist is poured in the die cavity of mould, then carried out matched moulds orientation, upper and lower shape product pressure head enters in die cavity and carries out two-way compacting subsequently, then demagnetization, and seaming chuck backhaul, push-down head ejects the pressed compact demoulding.Pressed compact is carried out obtaining sintering blank (this blank is shown in that after mill processing light size setting value is for D18x32mm) after sintering timeliness.Size and the magnetic property of measuring sintering blank, data are in table 2.
Comparative example 2:
NdFeB micro mist is poured in the die cavity of the mould that geomery is identical with embodiment 2, then carried out matched moulds orientation, upper and lower shape product pressure head enters in die cavity and carries out two-way compacting subsequently, then demagnetization, and seaming chuck backhaul, push-down head ejects the pressed compact demoulding.Pressed compact is carried out obtaining sintering blank (this blank is shown in that after mill processing light size setting value is for D18x32mm) after sintering timeliness.Size and the magnetic property of measuring sintering blank, data are in table 2.
Table 2
Embodiment 3:
Fig. 4 A, 4B, 4C are the structural representations of the mould of the trapezoidal product of compacting, and 1 is die cavity as shown in the figure, and 2 is graphite material layer, and 3 is magnetic conductive material layer.Die body is made up of the magnetic conductive material layer in outside and the thick graphite material layer of inner side 30mm, and upper and lower pressure head is also made up of permeability magnetic material and graphite material, and its graphite material layer thickness contact with compacting powder is also 30mm.The range of friction coefficients of graphite material layer is 0.04～0.1, and thermal coefficient of expansion scope is (0.5～3) * 10
-6k
-1, Moh's scale number scope is 1～3, fineness value scope is > 0.4.NdFeB micro mist is poured in the die cavity of mould, then carried out matched moulds orientation, upper and lower shape product pressure head enters in die cavity and carries out two-way compacting subsequently, then demagnetization, and seaming chuck backhaul, push-down head ejects the pressed compact demoulding.Pressed compact is carried out to obtain sintering blank after sintering timeliness, and (this blank is shown in that after mill processing light size setting value is 70x44x32x18mm, 44mm is that the upper base of trapezoidal product is long, 70mm is the length of going to the bottom of trapezoidal product, the chord length that 32mm is trapezoidal product, the thickness that 18mm is trapezoidal product).Size and the magnetic property of measuring sintering blank, data are in table 3.
Comparative example 3:
NdFeB micro mist is poured in the die cavity of the mould that geomery is identical with embodiment 2, then carried out matched moulds orientation, upper and lower shape product pressure head enters in die cavity and carries out two-way compacting subsequently, then demagnetization, and seaming chuck backhaul, push-down head ejects the pressed compact demoulding.Pressed compact is carried out obtaining sintering blank (this blank is shown in that after mill processing light size setting value is for 70x44x32x18mm) after sintering timeliness.Size and the magnetic property of measuring sintering blank, data are in table 3.
Table 3
Be only several limited specific embodiment of the present invention above, composite die of the present invention is also applicable to the product of other various shapes.
Claims (10)
1. a composite die, it comprises die body and upper push-down head, it is characterized in that: described die body is integral structure, the medial and lateral of die body and upper push-down head are made up of different materials.
2. a composite die as claimed in claim 1, is characterized in that: the outside of described die body and upper push-down head is permeability magnetic material, and inner side is graphite material.
3. a composite die as claimed in claim 2, is characterized in that: inside described die body and upper push-down head, the thickness range of graphite material layer is 5～30mm.
4. a composite die as claimed in claim 2, is characterized in that: the range of friction coefficients of described graphite material layer and powder contact-making surface is 0.04～0.1.
5. a composite die as claimed in claim 2, is characterized in that: the fineness scope of described graphite material layer and powder contact-making surface is > 0.4.
6. a composite die as claimed in claim 2, is characterized in that: the thermal coefficient of expansion scope of described graphite material layer is (0.5～3) x10
-6k
-1.
7. a composite die as claimed in claim 2, is characterized in that: the Moh's scale number scope of described graphite material layer is 1～3.
8. a composite die as claimed in claim 1, is characterized in that: the range of friction coefficients of described die body mould intracavity wall is 0.04～0.1.
9. a composite die as claimed in claim 1, is characterized in that: the fineness value scope of described die body mould intracavity wall is > 0.4.
10. a composite die as claimed in claim 1, is characterized in that: the thermal coefficient of expansion scope of described die body mould intracavity wall is (0.5～3) x10
-6k
-1, Moh's scale number scope is 1～3.
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| CN201210524744.4A CN103846435B (en) | 2012-12-07 | 2012-12-07 | A kind of composite die |
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| CN201210524744.4A CN103846435B (en) | 2012-12-07 | 2012-12-07 | A kind of composite die |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105547775A (en) * | 2015-12-11 | 2016-05-04 | 平高集团有限公司 | Manufacturing method and pressing die for standard micro-crack defect test block |
| CN106971800A (en) * | 2017-03-17 | 2017-07-21 | 京磁材料科技股份有限公司 | The pressed 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 |
| JP2019114715A (en) * | 2017-12-25 | 2019-07-11 | イビデン株式会社 | Method of manufacturing sintered magnet, graphite mold for hot press, and method for manufacturing graphite mold for hot press |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105547775A (en) * | 2015-12-11 | 2016-05-04 | 平高集团有限公司 | Manufacturing method and pressing die for standard micro-crack defect test block |
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| CN106971800A (en) * | 2017-03-17 | 2017-07-21 | 京磁材料科技股份有限公司 | The pressed compact preparation method of Sintered NdFeB magnet |
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| 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 |
| JP2019114715A (en) * | 2017-12-25 | 2019-07-11 | イビデン株式会社 | Method of manufacturing sintered magnet, graphite mold for hot press, and method for manufacturing graphite mold for hot press |
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| CN103846435B (en) | 2018-09-18 |
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