CN205519649U - Pressure setting - Google Patents
Pressure setting Download PDFInfo
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- CN205519649U CN205519649U CN201620256356.6U CN201620256356U CN205519649U CN 205519649 U CN205519649 U CN 205519649U CN 201620256356 U CN201620256356 U CN 201620256356U CN 205519649 U CN205519649 U CN 205519649U
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- pressure setting
- magnetic field
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- magnaglo
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- 238000007493 shaping process Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims description 35
- 238000004826 seaming Methods 0.000 claims description 35
- 239000000843 powder Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 27
- 239000000956 alloy Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 238000007667 floating Methods 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 13
- 229910052761 rare earth metal Inorganic materials 0.000 description 13
- 230000033228 biological regulation Effects 0.000 description 10
- 150000002910 rare earth metals Chemical class 0.000 description 9
- 230000001629 suppression Effects 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052796 boron Inorganic materials 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 229910052789 astatine Inorganic materials 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- ZDVYABSQRRRIOJ-UHFFFAOYSA-N boron;iron Chemical compound [Fe]#B ZDVYABSQRRRIOJ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- Powder Metallurgy (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The utility model discloses a pressure setting. The perforating hole of moulding -die is including length ld and width wd's the shaping portion and the 22tL of toper portion of the portion's upside that takes shape, 22tW, the 22tL of toper portion the top length is 2 big ls than ld, the 22tW of toper portion topmost width equals or compares 2 big ws of wd with wd, if the 22tL of toper portion topmost wide direction one end limit with take shape the wide direction one end limit of portion rectangular to poor for ls1, the 22tL of toper portion topmost wide direction other end limit with take shape the wide direction other end limit of portion rectangular to poor for ls2, the 22tW of toper portion is rectangular to one end limit and poor the be ws1 of shaping minister's direction one end limit in wide direction topmost, the 22tW of toper portion topmost rectangular to other end limit with take shape the length direction of portion other end limit wide direction poor during for ws2, ls1+Ls2=2Ls, ws1+Ws2=2Ws, ls1+Ls2 > ws1+Ws2.
Description
Technical field
This utility model relates to powder pressing device (hereinafter referred to as " pressure setting ") and the manufacture method of Magnet, especially
Relate to the manufacture method of the device used in the manufacture of rare-earth sintered magnet and rare-earth sintered magnet.
Background technology
Permanent magnet (hreinafter referred to as " Magnet ") uses as variously-shaped flat thin magnet.Uncommon great soil group Magnet has excellent
Different magnetic characteristic, is widely used.As rare-earth sintered magnet, terres rares cobalt based magnet and dilute is widely used in each field
Great soil group ferrum boron based magnet both.Wherein, rare earth, iron boron based magnet (hereinafter referred to as " R-Fe-B based magnet ") exists
All showing the highest maximum magnetic energy product in various Magnet, price is the most relatively cheap, so setting for various electronics the most energetically
Standby.
The flat thin magnet of R-Fe-B system sintered magnet manufactures the most by the following method.Additionally, in this manual, non-magnetic
The also referred to as Magnet of change state.
Prepare the powder with the R-Fe-B system alloy of required composition.Magnetic field is pressed into by alloy powder is carried out
Shape, the formed body of available required form, by being sintered available sintered body to formed body.As required, sintered body quilt
Implement the heat treatment added.Before or after heat treating, accept machining, become the Magnet of required size and shape
Sheet.Afterwards, flat thin magnet is flushed to remove grinding powder or the grinding producing and being attached to magnet surface because of machining
Liquid.
In order to improve manufacture efficiency or the yield rate of material of the flat thin magnet of R-Fe-B system sintered magnet, attempt formation and have
The formed body of the shape close with the shape of final flat thin magnet.
Being shaped as of formed body is various, has writing board shape, block-shaped, bowed shape, cylindrical shape, half-conical shape
Deng.
Because of the shape of formed body, produce be full of cracks sometimes when being pulled out into body from the die cavity of the pressing mold of pressure setting.Its
In, apply alignment magnetic field abreast especially for the central shaft with cylindrical shape, and become with the direction orthogonal with shaping direction
For alignment magnetic field apply direction mode be configured with in the pressure setting of magnetic field generation device, the formed body of cylindrical shape from
When the die cavity of pressing mold is extracted, easily produce be full of cracks.
Patent documentation 1 is disclosed that powder compacting pressure setting as described below, it may be assumed that improvement guides for powder box with for powder box
Rod, by pressing mold to supply powder by the way of becoming semi-cylindrical form, it is possible to increase the uniformity of the Density Distribution of powder,
The formed body of subcylindrical shape can be obtained.Additionally, powder compacting pressure setting described in patent documentation 1 is usual
The device of powder used in metallurgy, be silent on the example that rare earth element magnet Magnaglo is formed.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Laid-Open Patent Publication 59-166601 publication
Summary of the invention
The problem that invention is to be solved
In the powder forming unit that patent documentation 1 is recorded, in order to supply powder in the way of becoming semi-cylindrical form, make
Slide along the central shaft of semi-cylindrical form for powder box.Therefore, when making the formed body of cylindrical shape of Magnaglo, it is impossible to
Magnetic field generation device is configured in the way of the central shaft with cylindrical shape applies alignment magnetic field abreast.
It addition, Magnaglo (particularly rare earth element magnet Magnaglo) is recorded than patent documentation 1 due to mobility
Superhard alloy powder is low, even if therefore using above-mentioned supplying powder box or guide rod for powder box, is also not easy to become semi-cylindrical
The mode of shape is supplied uniformly across powder.
Therefore, even if the powder forming unit using patent documentation 1 to record makes the one-tenth of the cylindrical shape of Magnaglo
Body, can not eliminate be full of cracks.More can not make the central shaft with cylindrical shape and carry out the cylinder of magnetic field orientating abreast
The formed body of shape.
The purpose of this utility model is, it is provided that the manufacturer of the Magnet of a kind of pressure setting and this pressure setting of use
Method, wherein, even if described pressure setting uses powder feeder unit same as the prior art, it is also possible to the cylinder of suppression Magnaglo
The shaping of the formed body that shape etc. are bar-shaped produces be full of cracks.
For solving the technical scheme of problem
The pressure setting of this utility model embodiment includes that the pressing mold with the through hole forming die cavity is for filling
Magnaglo in described die cavity carries out seaming chuck and the push-down head suppressed, and wherein, the through hole of described pressing mold includes: have
Length Ld and the forming section of width Wd, wherein Ld ＞ Wd；With the tapered portion of the upside being formed at described forming section, described tapered portion
The length L 2 × Ls bigger than Ld of the top, width W with Wd of the top of described tapered portion is equal or bigger 2 × Ws than Wd, when
If a side end edge of a side end edge of the width of the top of described tapered portion and the width of described forming section is being grown
Difference on degree direction is Ls1, sets the opposite side end edge of the width of the top of described tapered portion and the width of described forming section
The opposite side end edge in degree direction difference in the longitudinal direction is Ls2, sets the side of the length direction of the top of described tapered portion
One side end edge of the length direction of end edge and described forming section difference in the direction of the width is Ws1, set going up most of described tapered portion
The opposite side end edge of the length direction of end with the opposite side end edge of the length direction of described forming section difference is in the direction of the width
During Ws2, Ls1+Ls2=2 × Ls, Ls1+Ls2 are bigger than Ws1+Ws2.Additionally, "×" represents multiplying.By to obtained
Formed body is sintered, available sintered body, such as sintered magnet.
In certain embodiment, Ls be more than 0.075mm below 0.15mm, Ws be more than 0mm below 0.025mm.
In certain embodiment, meet Ls/Ld ＞ Ws/Wd.
In certain embodiment, have and produce for the magnetic field that the described Magnaglo in described die cavity is applied alignment magnetic field
Generating apparatus, described magnetic field generation device is configured to apply described alignment magnetic field abreast with described length direction.
In certain embodiment, in described seaming chuck and described push-down head, the pressurized plane of at least one comprises curved surface.
In certain embodiment, the pressurized plane of described seaming chuck and described both push-down heads comprises concave curved surface.
In certain embodiment, the pressurized plane of described seaming chuck and described push-down head is the face after mirror finish.
The manufacture method of the Magnet of this utility model embodiment includes: operation (a), prepares Magnaglo；Operation (b),
Described Magnaglo is filled in the described die cavity of the pressure setting described in above-mentioned any one；Operation (c), makes under described seaming chuck
Fall, until the lower end of described seaming chuck is positioned at the described forming section of described through hole, utilizes described push-down head and described seaming chuck,
The described Magnaglo being filled in described die cavity is pressurizeed, makes the formed body with the regulation density predetermined；
Operation (d), after operation (c), when pressing described formed body with described push-down head and described seaming chuck, makes described
Pressing mold relatively declines relative to described seaming chuck and described push-down head, until being integrally located at of described formed body is more through than described
Till the position that the top in hole is more top.
In certain embodiment, described operation (b) is in the way of the upper surface of described Magnaglo becomes general planar
The operation of described Magnaglo is filled in described die cavity.
In certain embodiment, described operation (c) the described Magnaglo being filled in described die cavity is applied with
Carry out under the state of the alignment magnetic field that described length Ld is parallel.
In certain embodiment, described Magnaglo is rare earth element magnet Magnaglo.
Invention effect
According to this utility model, using the teaching of the invention it is possible to provide the manufacturer of the Magnet of a kind of pressure setting and this pressure setting of use
Method, wherein, even if described pressure setting uses powder feeder unit same as the prior art, it is also possible to suppression cylindrical shape etc. are bar-shaped
Formed body shaping in produce be full of cracks.
Accompanying drawing explanation
Fig. 1 (a)～(c) are the schematic diagrams of the pressure setting 100 of this utility model embodiment, and (a) is the A-along (c)
The sectional view of A ' line, (b) is the sectional view of the B-B ' line along (c), and (c) is to eliminate bowing of state later for seaming chuck 12U
View.
Fig. 2 produces the figure of the situation of be full of cracks when being and represent and shaped by generally cylindrical formed body 10G.
Fig. 3 is the chart of the relation between withdrawing pattern amount and the displacement representing pressing mold.
Symbol description
10 die cavitys
12U seaming chuck
12L push-down head
22 pressing molds
22a through hole
22tL, 22tW tapered portion
32 magnetic field generation devices
Detailed description of the invention
Below, referring to the drawings to the pressure setting of this utility model embodiment and the system of the Magnet using this pressure setting
The method of making illustrates.In following, the manufacture of rare-earth sintered magnet particularly R-Fe-B system sintered magnet is used
The manufacture method of pressure setting and rare-earth sintered magnet illustrates, but is not limited to embodiment of the present utility model.
Here, composition R-T-(the M)-B of R-Fe-B system sintered magnet represents, R is the rare earth element containing Y, and necessarily
Containing the mixture that Nd, T are Fe or Fe Yu Co and/or Ni, M be addition element (such as, A1, Ti, Cu, V, Cr, Ni, Ga, Zr,
At least one in Nb, Mo, In, Sn, Hf, Ta, W), B is the mixture of boron or boron and carbon.
As shown in Fig. 1 (a)～(c), the pressure setting 100 of embodiment of the present utility model includes having formation die cavity 10
Through hole 22a pressing mold 22 and for seaming chuck 12U that the Magnaglo being filled in die cavity 10 is suppressed and under press
Head 12L.The through hole 22a of pressing mold 22 includes: have length Ld and the forming section of width Wd (Ld ＞ Wd)；Be formed at forming section
Tapered portion 22tL of upside, 22tW.Pressure setting 100 is single shaft pressure setting, such as, hydraulic press.
Length Ld of the forming section of through hole 22a and Wd are certain (not changing relative to the degree of depth), limit the length of die cavity 10
Degree Ld and width Wd.Tapered portion 22tL, the length and width of 22tW change along with the degree of depth, going up most closer to through hole 22a
Hold the biggest.The length L 2 × Ls bigger than Ld of the top of tapered portion 22tL, width W with Wd of the top of tapered portion 22tW is equal
Or it is bigger 2 × Ws than Wd, when the width of a side end edge and forming section of the width of the top setting tapered portion 22tL
One side end edge difference in the longitudinal direction is Ls1, set the top of tapered portion 22tL width opposite side end edge with become
The opposite side end edge of the width in shape portion difference in the longitudinal direction is Ls2, sets the length side of the top of tapered portion 22tW
To the side end edge difference in the direction of the width of length direction of a side end edge and above-mentioned forming section be Ws1, set above-mentioned taper
The opposite side end edge of the opposite side end edge of the length direction of the top of portion 22tW and the length direction of above-mentioned forming section is at width
When difference on direction is Ws2, Ls1+Ls2=2 × Ls, Ls1 and Ls2 are individually big than Ws.
Here, Ls to be referred to as length direction withdrawing pattern amount, Ws is referred to as width withdrawing pattern amount.In the following description, for
For the sake of simple, as shown in Fig. 1 (a) and (b), as typical example, the situation that illustration Ls and Ws is the most equal in both sides.At this
In the pressure setting 100 of utility model embodiment, length direction withdrawing pattern amount Ls and width withdrawing pattern amount Ws are without in both sides
Equal.That is, when set the length direction withdrawing pattern amount of a side end edge as Ls1, set the length direction withdrawing pattern amount of opposite side end edge as Ls2
Time, it is not necessary to Ls1=Ls2, it is also possible to Ls1 ≠ Ls2.Now, 2 above-mentioned × Ls corresponds to Ls1+Ls2.Equally, when setting a side
The width withdrawing pattern amount on limit is Ws1, when setting the width withdrawing pattern amount of opposite side end edge as Ws2, it is not necessary to Ws1=Ws2.When
During Ws1 ≠ Ws2,2 above-mentioned × Ws corresponds to Ws1+Ws2.When Ls1 ≠ Ls2 and Ws1 ≠ Ws2 also so, as long as meeting Ls1+
This relation of Ls2 ＞ Ws1+Ws2, it is not necessary to Ls1 and Ls2 is individually big than Ws1, Ws2.
As described in experimental example below, when using the pressure setting 100 of this utility model embodiment, it is possible to do not make
Become in the case of the formed body generation be full of cracks that the formed body particularly cylindrical shape of the R-Fe-B system sintered magnet of Fig. 2 etc. are bar-shaped
Shape, extract.Bar-shaped formed body refer to when the length length of rod () that be set as body be a (for Lg in Fig. 2), width be that b is (in Fig. 2
For Wg), thickness be the formed body of shape during c (in Fig. 2 for Tg) with the relation meeting a ＞ b, c.Even if pressure setting 100
It is the elongated bar-shaped formed body of a ＞ 2b, 2c, it is also possible to form.In the case of cylindrical shape, width b=thickness c, b
With the bottom surface diameter of a circle that c is equal to cylinder.As it is shown in figure 1, when using pressure setting 100, it is possible to by by bar-shaped formed body
Suppress in direction orthogonal to the longitudinal direction and shape.When suppressing in this direction, as described below, utilize with
Forming process (quadrature field forming process) in the magnetic field in the applying magnetic field, direction that pressing direction is orthogonal, it is possible to be produced on bar-shaped formed body
Length direction on carried out the formed body of magnetic field orientating.For instance, it is possible to the central shaft making the formed body with cylindrical shape is put down
Carried out the formed body of magnetic field orientating row (in the longitudinal direction).
As it is shown in figure 1, pressure setting 100 can have the magnetic field for the Magnaglo in die cavity 10 applies alignment magnetic field
Generator 32.Magnetic field generation device 32 is configured to apply abreast alignment magnetic field with length direction.When using this pressure setting
When 100, by quadrature field forming process, it is possible to be produced on the length direction of cylindric die cavity 10 and carried out the one-tenth of magnetic field orientating
Body.In quadrature field forming process, owing to will not upset the state of orientation of magnetic particle when shaping, therefore with compacting
In the magnetic field in the applying magnetic field, direction that direction is parallel, forming process (parallel magnetic field forming process) is compared, and the magnetic of the Magnet finally given is special
Property improve.Alignment magnetic field both can be magnetostatic field, it is also possible to be pulsed magnetic field, it is also possible to combine use by both.Right
The formed body of the Magnaglo of rare-earth sintered magnet carry out compressing in the case of, the intensity of alignment magnetic field be preferably
More than 0.8T below 4.0T.
The manufacture method of the R-Fe-B system sintered magnet using pressure setting 100 is illustrated.
First, the Magnaglo of R-Fe-B system sintered magnet is prepared.The Magnaglo of R-Fe-B system sintered magnet leads to
Cross known method to make (for example, referring to Japanese Patent Publication 6-6728 publication (Japanese Laid-Open Patent Publication 63-33505 public affairs
Report)).In order to carry out reference, the disclosure of Japanese Patent Publication 6-6728 publication is all enrolled in this specification.
As Magnaglo, prepare following powder.
With become Nd be 23.0 mass %, Pr be 6.5 mass %, Dy be 3.0 mass %, Al be that 0.1 mass %, Co are
2.0 mass %, Ga be 0.08 mass %, Cu be 0.1 mass %, B be 0.98 mass %, remaining be that the mode of composition of Fe is carried out
Composition regulation, by band casting, makes the alloy sheet that thickness is 0.2mm～0.3mm.
Then, this alloy sheet is filled in container, is accommodated in hydrogen processing means.Then, by by hydrogen processing means
The interior hydrogen being full of pressure 50kPa, at room temperature makes alloy sheet inhale hydrogen, makes it release hydrogen the most again.By carrying out this hydrogen
Process, alloy sheet is brittle, produce the amorphous powder that size is about 0.15mm～2mm.
The corase grind powder made being processed by above-mentioned hydrogen adds the zinc stearate of 0.05 mass % as grinding aid, enters
Row mixing, then carries out the pulverizing process carried out by air flow crushing device, and thus producing median particle diameter (D50) is the thin of 4 μm
Powder.
Then, in the die cavity 10 of pressure setting 100, Magnaglo is filled.Push-down head 12L is inserted the through of pressing mold 22
In the 22a of hole, and the pressurized plane (upper surface) of push-down head 12L is fixed on assigned position.Both pressing mold 22 can have been made to move, it is also possible to
Push-down head 12L is made to move.The position of the pressurized plane of push-down head 12L is by the volume in order to fill the die cavity 10 required for Magnaglo
Limit.Magnaglo is filled in formed the die cavity 10 delimited by the pressurized plane of push-down head 12L and the inner surface of through hole 22a.
The filling work procedure of Magnaglo such as can use floating method to implement (for example, referring to Japanese Unexamined Patent Publication 2000-248301 public affairs
Report).When using floating method, it is possible to become a face according to the surface (upper surface) of Magnaglo and the surface of pressing mold 22
Mode fills Magnaglo.Therefore, it is possible to fill Magnaglo quantitatively.
It addition, when using floating method, it is possible to according to making floating direction and magnetic field generation device in stamper surface
Powder filling apparatus and magnetic field generation device are arranged at pressure setting by the mode in 90 ° of directions of difference, applying direction, magnetic field, it is possible to
Make the central shaft with the formed body of cylindrical shape and (in the longitudinal direction) carry out the formed body of magnetic field orientating abreast.
It follows that the forming section of the through hole 22a at pressing mold 22, utilize push-down head 12L and seaming chuck 12U to being filled in mould
Magnaglo in chamber 10 pressurizes.That is, seaming chuck 12U is made to decline, until the lower end of seaming chuck 12U is positioned at through hole 22a
Forming section till, utilize push-down head 12L and seaming chuck 12U, the Magnaglo being filled in die cavity 10 pressurizeed, make
There is the formed body of the regulation density predetermined.When pressurization, magnetic field generation device produce the magnetic of such as 0.8T～4.0T
, make the Magnaglo in die cavity 10 carry out magnetic field orientating in the direction orthogonal with compression aspect.In this compression section, make
Pressure head 12U declines, and compresses Magnaglo, makes in the position becoming regulation density the decline of seaming chuck 12U stop.Now, above
The lower end of pressure head 12U be positioned at forming section Ld, Wd and do not close on tapered portion 22tL, the mode of 22tW makes the decline of seaming chuck 12U stop
Only, so that the side of formed body will not become taper.This stop position can by so-called underfill action easily
Regulation, so-called underfill action is to make pressing mold 22 increase after being filled with Magnaglo and make Magnaglo at die cavity 10
The action of interior relative drop.In other words, stop position can come by being filled with the ascending amount of the later pressing mold of Magnaglo 22
Regulation.
As the regulation density of formed body, such as, it is used for manufacturing true density and is about 7.5g/cm3R-Fe-B system sintered magnet
The density of formed body be preferably greater than 4.0g/cm3(about the 53% of true density), more preferably 4.3g/cm3(about true density
57%) more than.When the density of formed body is 4g/cm3Time following, mostly occur when carrying (transfer etc.) of formed body damaged or
Crackle, causes manufacturing efficiency and declines.Pressing pressure or press time for obtaining the formed body of regulation density pass through to grind in advance
Beg for and suitably set.
Pressing mold 22, push-down head 12L and seaming chuck 12U are formed by superhard alloy (such as, WC-Ni system superhard alloy).It addition,
The pressurized plane of push-down head 12L and seaming chuck 12U is preferably the face after mirror finish.If push-down head 12L and seaming chuck 12U adds
Pressure surface is minute surface, then applying in the case of alignment magnetic field forms, it is possible to taking of suppression magnetic powder particles
To disorderly because of the friction with pressurized plane.Particularly, in quadrature field forming process, effect is notable.
As it has been described above, after the formed body having obtained regulation density, push-down head 12L and seaming chuck 12U are being pressed into
Under the state of body, pressing mold 22 is made relatively to decline relative to seaming chuck 12U and push-down head 12L, until the overall position of formed body
The position more top in the top than through hole 22a.Now, the local stripping of the crackle or formed body in order to prevent formed body
From, when being pressed into body by seaming chuck 12U, or make seaming chuck 12U somewhat increase and blood pressure lowering and keep it to press
Under the state of power, make pressing mold 22 decline and be pulled out into body.
Afterwards, by formed body is sintered, obtain sintered body, implement the heat treatment added as required.These operations are led to
Cross known method to carry out.Such as, sintering is by carrying out with 1050 DEG C of heat treatments carried out 2 hours in argon gas atmosphere.
Cylindric sintered body is cut into the most multiple discoid sintered body sheet.As required, implement surface and process, then carry out magnetic
Change, become flat thin magnet.
But, enumerated as described in experimental example, when using, length direction withdrawing pattern amount Ls and width withdrawing pattern amount Ws are equal
When pressing mold forms the cylindric formed body relation of a ＞ b, c (length a, width b, the thickness c have), Testudinis can occur altofrequency ground
Split.
Here, see figures.1.and.2 explanation use have the structure identical with pressure setting 100 and length and width it
The reason of be full of cracks is there is in difference when being unsatisfactory for the pressure setting of above-mentioned condition (Ls1, Ls2 ＞ Ws) to form cylindric formed body 10G.
As in figure 2 it is shown, cylindric formed body 10G has bar portion 10Gf on the outer peripheral face of cylinder.The width of bar portion 10Gf
Wf is arranged for preventing seaming chuck 12U from colliding with push-down head 12L.Therefore, the width Wf of bar portion 10Gf depends on confession
The precision of powder amount and the precision of the clearance portion (clearance) by the stop position decision of seaming chuck 12U and push-down head 12L, if
It is set to more than 0.5mm below 3.0mm.It is preferably set to more than 0.5mm below 2.0mm.
The pressurized plane of seaming chuck 12U and push-down head 12L is (in Fig. 1 (a), (b), with the powder contact being positioned at die cavity 10
The face of side) it is to remove the circular arc that radius is Wd/2 beyond clearance portion (with reference to Fig. 1 (b)) to be perpendicular to paper in Fig. 1 (b)
Direction extend curved surface.Therefore, when shown in Fig. 1 seaming chuck 12U decline and compression be filled in die cavity 10 Magnaglo and
When obtaining formed body, only need to somewhat cut bar portion in the mode along the outer peripheral face of the cylinder with the radius bottom surface as Wd/2
10Gf, it becomes possible to obtain the cylindric formed body as purpose.Therefore, when obtaining the cylindric formed body 10G shown in Fig. 2,
Just can improve the yield rate of material for obtaining the formed body (or sintered body) as purpose.
But, when difference Ls (=Ls1=Ls2) using length direction is equal with difference Ws of width (=Ws1=Ws2)
Pressing mold when forming the cylindric formed body 10G shown in Fig. 2, be full of cracks 10cr can occur altofrequency ground.
Even if it addition, use the pressing mold of difference Ls of length direction and the equal nothing of difference Ws of width to form, also can be high
There is be full of cracks 10cr in frequency ground.
As in figure 2 it is shown, the lower horizontal ground of the be full of cracks 10cr bar portion 10Gf from cylindric formed body 10G produces in the width direction
Raw.Think that the occurrence cause of be full of cracks 10cr is as described below.
When being pressed into body by push-down head 12L and seaming chuck 12U, from the through hole 22a of pressing mold 22 out time,
Compared with the curvature portion of formed body 10G, other parts, it is difficult to displacement in the width direction, the stretching putting on bar portion 10Gf should
Other parts of force rate are big.Now, because the displacement of formed body that the tensile stress putting on bar portion 10Gf causes is to exceed into
The size of the degree of body intensity, it is believed that there occurs be full of cracks 10cr.This be full of cracks is particularly easy in the pressurization with push-down head 12L
The part of face contact produces.
Therefore, above-mentioned investigation based on inventor, the method that investigated the displacement of suppression width.In Fig. 1 institute
In the pressure setting 100 shown, length Ld of die cavity 10 is set to 82.00mm by use, width Wd is set to 28.00mm, tapered portion 12
Height h be set to 20.00mm, and difference Ws (=Ws1=Ws2) of difference Ls (=Ls1=Ls2) of length direction and width is no
9 kinds of same pressing molds 22, produce formed body 10G (sample No.1～No.9).Additionally, about sample No.9, pulling out of width
Modulus is set to zero.Shape and carried out by above-mentioned operation.Molding condition is, regulation clearance portion is so that the width of bar portion 10Gf
Wf is more than 0.5mm below 2.0mm, and length Tg of formed body is set to 28.00mm ± 0.03mm, the density of formed body is set to
4.30g±0.03g.It addition, alignment magnetic field applies 1.3T at the length direction of die cavity 10.
The formed body 10G of obtained sample No.1～No.9 is measured respective length Lg and width Wg, Lg-Ld is set
For length direction displacement, Wg-Wd being set to width displacement, what following table 1 represented is obtained result.At table
In 1, respectively with difference Ls by length direction of length Ld of die cavity 10 and width Wd and the difference Ws standardization of width, will be with hundred
Point value that rate represents (Ls/Ld and Ws/Wd) represents in parantheses.Additionally, sample number is each 50, the numeric representation of table 1 be
Meansigma methods.It addition, represent the chart of relation between difference Ls of length direction and displacement about sample No.1～No.8, Fig. 3.
(table 1)
From the figure 3, it may be seen that when difference Ws of width is set to necessarily (0.025mm), and make the difference of length direction from Ws
When equal 0.025mm increases, length direction displacement substantially monotone increasing, on the other hand, width displacement is the most single
Adjust and reduce little.So, it is known that increased by the withdrawing pattern amount making the length direction of cylindric formed body, it is possible to reduce the position of width
Shifting amount.
From the figure 3, it may be seen that difference Ls of length direction be more than 0.075mm, Ls/Ld be more than 0.091% time, width
Displacement is below 0.10mm, will not produce be full of cracks on formed body.This is zero in difference Ws of the width of sample No.9
In the case of also confirm.Here, by along formed body length direction formed wire crackle and can visual size be judged as
Be full of cracks.
Although additionally, the width displacement that the difference of length direction is set to the sample No.2 of 0.050mm is 0.14mm,
Width displacement compared to the sample No.1 that the difference of length direction is the 0.025mm equal with the difference of width
Reduce more than 30% under 0.21mm, but be not entirely prevented from the generation of be full of cracks.But, the generation frequency of be full of cracks declines, and passes through
Make length direction pull out modular ratio width withdrawing pattern amount greatly, carry out increased length direction displacement, thus make width displacement
Reduce, suppression can be obtained and produce the effect of be full of cracks.
The condition of the generation of the be full of cracks of suppression width also can be by respectively with length Ld and the width Wd mark of die cavity 10
Value (stating with percentage rate) after standardization limits difference Ls of length direction and difference Ws of width.
As Ls/Ld and Ws/Wd shown in observing the parantheses of difference of the difference of length direction of table 1 and width, can
Know that sample No.3～No.9 not producing be full of cracks meets Ls/Ld ＞ Ws/Wd.I.e., it is possible to say in making illustration that easily
In the case of the formed body of generation be full of cracks also so, as long as meeting Ls/Ld ＞ Ws/Wd, it becomes possible to prevent be full of cracks from producing.
Additionally, when the displacement quantitative change of length direction is big, have the tendency that powder falling amount increases.Here, powder falling is compression section
In the emerging of Magnaglo, also become the reason of the overlap of formed body.The sample No.7 that particularly difference of length direction is big and
The powder falling amount of No.8 is more.Therefore, it can be said that the most do not produce be full of cracks and the one-tenth of few sample No.3～No.6 of powder falling amount
The pressing mold that shape is used.Thus, it is possible to say difference Ls in preferred length direction be more than 0.075mm or Ls/Ld be 0.091% with
On, and difference Ls in preferred length direction less than 0.175mm or Ls/Ld less than 0.21%.It addition, for Ls/Ld and Ws/Wd,
It may be said that (Ls/Ld)/(Ws/Wd) is preferably more than 1.0 (0.091/0.089) 2.1 (0.184/0.089) below.
Then, about the cylindric formed body of all size, table 2 expression confirms not produce the ginseng of the pressing mold of be full of cracks
Number.Here, make the formed body also different in the range of 16mm～53mm for height h of tapered portion.
(table 2)
In whole samples of sample No.10～No.24, all meet the condition of Ls ＞ Ws.It addition, sample No.10～
The minima of difference Ls of the length direction of No.24 is 0.085mm, meets this condition of more than 0.075mm.Ws is more than 0mm
Below 0.025mm.The minima of Ls/Ld is 0.16%, meets 0.091% this condition.It addition, sample No.10～No.24
The maximum of length direction withdrawing pattern amount Ls is 0.150mm, meets this condition of below 0.175mm.The maximum of Ls/Ld is
0.22%.In table 2, the formed body meeting Ls/Ld ＞ Ws/Wd is sample No.19～24, and is formed body bigger for Wd.
Combine with the result of table 1 see time, it may be said that make Wd more than the formed body of the cylindrical shape of 14mm in the case of, excellent
Be full foot Ls/Ld ＞ Ws/Wd.
So, when use this utility model embodiment pressure setting 100 time, it is possible to formed suppression produce be full of cracks and big
Cause the formed body 10G with the cylindrical shape as purpose.It addition, also be able to the central shaft of the cylindrical shape with formed body 10G
Apply alignment magnetic field abreast, also now be able to suppression and produce be full of cracks.
Certainly, the manufacture method not office of the Magnet of the pressure setting of this utility model embodiment and this pressure setting of use
It is limited to the situation making the formed body of cylindrical shape.In addition to the bar-shaped formed body of cylindrical shape, additionally it is possible to without chapping and efficient
Ground forms the bar-shaped formed body of the polygon prism shape of more than pentagonal prism shape.
Even it addition, the bar-shaped formed body that cross section is half-conical shape or bowed shape, it may have bar portion, in bar portion
Width narrow for more than 0.5mm below 2.0mm in the case of, tensile stress will concentrate on bar portion, sometimes produces Testudinis in bar portion
Split.By application this utility model, it is possible to without be full of cracks and form efficiently.
The pressure setting of this utility model embodiment is not only in the shaping of illustrated rare-earth magnet Magnaglo
In the case of, and in the case of employing the superhard alloy powder etc. that patent documentation 1 is recorded, circle can be made without be full of cracks
The formed body of post shapes.
Industrial utilizability
This utility model can be widely used for the manufacture of the Magnet such as such as rare-earth sintered magnet.
Claims (12)
1. a pressure setting, it includes having the pressing mold of the through hole forming die cavity and for being filled in described die cavity
Magnaglo carries out seaming chuck and the push-down head suppressed, and described pressure setting is characterised by:
The through hole of described pressing mold includes: have length Ld and the forming section of width Wd, wherein Ld ＞ Wd；Be formed at described become
The tapered portion of the upside in shape portion,
The length L 2 × Ls bigger than Ld of the top of described tapered portion, width W with Wd of the top of described tapered portion equal or
It is bigger 2 × Ws than Wd,
The side of width of a side end edge and described forming section when the width of the top setting described tapered portion
Limit difference in the longitudinal direction is Ls1, sets the opposite side end edge of the width of the top of described tapered portion and described shaping
The opposite side end edge of the width in portion difference in the longitudinal direction is Ls2, sets the length direction of the top of described tapered portion
The side end edge difference in the direction of the width of length direction of a side end edge and described forming section be Ws1, set described tapered portion
The top length direction opposite side end edge and described forming section length direction opposite side end edge in the direction of the width
Difference when being Ws2, Ls1+Ls2=2 × Ls, Ws1+Ws2=2 × Ws, Ls1+Ls2 is bigger than Ws1+Ws2.
2. pressure setting as claimed in claim 1, it is characterised in that:
Ls be more than 0.075mm below 0.15mm, Ws be more than 0mm below 0.025mm.
3. pressure setting as claimed in claim 1 or 2, it is characterised in that:
Meet Ls/Ld ＞ Ws/Wd.
4. pressure setting as described in claim 1 or 2, it is characterised in that:
There is the magnetic field generation device for the described Magnaglo in described die cavity applies alignment magnetic field,
Described magnetic field generation device is configured to apply described alignment magnetic field abreast with described length direction.
5. pressure setting as described in claim 1 or 2, it is characterised in that:
In described seaming chuck and described push-down head, the pressurized plane of at least one comprises curved surface.
6. pressure setting as described in claim 1 or 2, it is characterised in that:
The pressurized plane of described seaming chuck and described push-down head comprises concave curved surface.
7. pressure setting as described in claim 1 or 2, it is characterised in that:
The pressurized plane of described seaming chuck and described push-down head is the face after mirror finish.
8. pressure setting as described in claim 1 or 2, it is characterised in that:
Also include: powder filling apparatus, with floating method, described Magnaglo is filled in described die cavity；Dress is produced with magnetic field
Put, for the described Magnaglo in described die cavity is applied alignment magnetic field,
Floating direction differs 90 ° with the direction of described alignment magnetic field.
9. pressure setting as described in claim 1 or 2, it is characterised in that:
Described seaming chuck and the described push-down head of described pressing mold are formed by hard alloy.
10. pressure setting as described in claim 1 or 2, it is characterised in that:
The height h of the described tapered portion of described pressing mold is more than 16mm below 53mm.
11. pressure settings as claimed in claim 3, it is characterised in that:
Ld is more than 67.57mm less than 82.00, and Wd is more than 14.63mm below 30.06mm.
12. pressure settings as claimed in claim 3, it is characterised in that:
The height h of the described tapered portion of described pressing mold is 20mm, and (Ls/Ld)/(Ws/Wd) is more than 1.0 and be less than 2.1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015068348A JP6477143B2 (en) | 2015-03-30 | 2015-03-30 | Press device and method of manufacturing magnet |
| JP2015-068348 | 2015-03-30 |
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| CN205519649U true CN205519649U (en) | 2016-08-31 |
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| CN201620256356.6U Active CN205519649U (en) | 2015-03-30 | 2016-03-30 | Pressure setting |
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| CN (1) | CN205519649U (en) |
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| CN107649679B (en) * | 2017-09-07 | 2023-08-22 | 浙江恒成硬质合金有限公司 | Powder metallurgy bar frame mould |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5855880B2 (en) * | 1976-02-26 | 1983-12-12 | 日産自動車株式会社 | Powder compression molding equipment |
| JPS5318066A (en) * | 1976-08-03 | 1978-02-18 | Meidensha Electric Mfg Co Ltd | Method for molding pulverulent body |
| JP3193912B2 (en) * | 1998-11-02 | 2001-07-30 | 住友特殊金属株式会社 | Powder pressing apparatus and powder pressing method |
| JP3560057B2 (en) * | 2000-02-17 | 2004-09-02 | 株式会社Ｎｅｏｍａｘ | Method for manufacturing powder compact and method for manufacturing magnet |
| JP4367764B2 (en) * | 2004-02-24 | 2009-11-18 | Ｔｄｋ株式会社 | Molded body, molding equipment in magnetic field |
| JP4432113B2 (en) * | 2004-09-29 | 2010-03-17 | Ｔｄｋ株式会社 | Molding apparatus and molding method |
| JP4470112B2 (en) * | 2005-01-31 | 2010-06-02 | Ｔｄｋ株式会社 | Molding equipment |
| JP2007254813A (en) * | 2006-03-23 | 2007-10-04 | Tdk Corp | Method for producing rare earth sintered magnet and die for molding used therefor |
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| JP6477143B2 (en) | 2019-03-06 |
| JP2016188402A (en) | 2016-11-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hitachi metal ring Ci material (Nantong) Co.,Ltd. Assignor: HITACHI METALS, Ltd. Contract record no.: 2017990000034 Denomination of utility model: Paper sheet pressing apparatus Granted publication date: 20160831 License type: Common License Record date: 20170209 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CU01 | Correction of utility model |
Correction item: A transferee of the entry into force of the contract Correct: Hitachi metal ring magnets (Nantong) Co.,Ltd. False: Hitachi metal ring Ci material (Nantong) Co.,Ltd. Number: 11 Volume: 33 |
|
| CU01 | Correction of utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20241022 Address after: Tokyo, Japan Patentee after: Hitachi, Ltd. Country or region after: Japan Address before: Tokyo, Japan Patentee before: HITACHI METALS, Ltd. Country or region before: Japan |