CN202411413U - Rare earth permanent magnet compression forming die - Google Patents
Rare earth permanent magnet compression forming die Download PDFInfo
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- CN202411413U CN202411413U CN2011205379660U CN201120537966U CN202411413U CN 202411413 U CN202411413 U CN 202411413U CN 2011205379660 U CN2011205379660 U CN 2011205379660U CN 201120537966 U CN201120537966 U CN 201120537966U CN 202411413 U CN202411413 U CN 202411413U
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Abstract
The utility model relates to a rare earth permanent magnet compression forming die. An upper male die is fixedly arranged on an upper male die template; a lower male die is fixedly arranged on a lower male die template; the upper end of the lower male die is tightly sleeved in a female die; the female die is fixedly arranged in a female die template; the upper end of a core rod is tightly sleeved in the lower male die; the bottom of the core rod is fixedly arranged on a core rod template; a die cavity is formed among the female die, the lower male die and the core rod; the core rod consists of two parts; the lower end of the core rod is provided with a cylinder with a mounting seat; the upper end of the core rod is provided with a cylinder; and the radius of the cylinder at the upper end is smaller than that of the cylinder at the lower end. Therefore, an additional die cavity is formed between the external surface of the upper end of the core rod and the internal surface of the female die, and internal stress can be released in the die cavity in the process of demolding a magnet upwards, so that the problem that the tolerance of the magnet is high due to an elastic aftereffect generated by releasing the internal stress in the magnet in the prior art is solved.
Description
Technical field
The utility model relates to the mould that a kind of powder press is used, and relates in particular to a kind of compressing and forming process compacting rare-earth permanent magnet forming mould of utilizing.
Background technology
Boned neodymium iron boron permanent magnet is the built-up magnet that contains rare earth element, has overall merits such as magnetic property height, dimensional accuracy is high, machinability is strong, uses very extensive in modern times in the industry.For example can be applied in various hard disk drives; Do driver magnet in the DVD drive; Can be applied in printer; Doing the driving motor magnet in the duplicator, also can be applied in automobile micro machine, the Magnetic Sensor, is various precision electric motors in the modern industry, the indispensable functional material of small and special electric machine.
Compressing and forming process is to produce the modal technology of boned neodymium iron boron permanent magnet.With behind the fast quenching NdFeB magnetic powder crushing and classification and binding resin; Other processing aid fully mixes, mixes; Magnetic compound after utilizing dry powder press or hydraulic press to mix is pressed into the Agglutinate neodymium-iron-boron magnet green compact of circular or tile; Then green compact are solidified under the temperature about 200 ℃, through grinding, become final product behind the coating process again.In the above step, utilizing mould is the key of control magnet size precision with the magnetic press forming.
Along with development of technology, various device is increasingly high to using therein boned neodymium iron boron permanent magnet to require, and is example with the hard disk drive of main flow; Conventional driver magnet is circular, and magnet thickness is merely 1.5 mm～2mm, and tolerance is 0.04 mm～0.06mm; Along with the volume of hard disk is more and more littler, rotating speed is increasingly high, and boned neodymium iron boron permanent magnet has proposed more harsh dimensional requirement to using therein; Become 0.8 mm～1mm like magnet thickness, tolerance≤± 0.03mm.
Mould is parts the most frequently used in the compressing and forming process.Chinese patent ZL0510025688 for example, the unitary mould that stamping of powder is shaped has been introduced the unitary mould that a kind of stamping of powder moulding is used, and mainly comprises: 1. go up punch; 2. go up the punch fixing body; 3. die; 4. die supporter; 5. lower punch; 6. lower punch fixing body; 7. press pedestal; 8. plug; 9. lower punch support; 10. one die cavity; 11. guide pillar, last punch are installed on the punch fixing body, die is installed on the die supporter, and lower punch is fixed by the lower punch fixing body, and plug is fixed on one die cavity bottom.The motion of die supporter can drive one die cavity, die and plug simultaneously and do identical motion up or down.During work, when die moved upward with respect to lower punch, powder got in the die cavity of die, plug and lower punch formation, and the lower end part in the die cavity has the bottom of the last plane of lower punch as powder entering die cavity, accomplishes the filling action.Go up punch then and move down, the pressed by powder in the die cavity is become circular green compact, accomplish the compacting action.After compacting was accomplished, last punch moved up, and mould, plug move downward with respect to lower punch, and it is motionless that lower punch keeps, and workpiece is ejected, and workpiece rests on the last plane of die, accomplished demoulding action.
This invention can not raised mould preparation tool precision, easy accessibility at press (punch press).But utilize this invent described mould the accuracy of manufacture require higher for example tolerance≤± 0.03mm, during the magnet of wall thickness 0.8 mm～1mm, can not meet the demands.Its reason is that in the knockout course, the magnet green compact are inner because the effect of internal stress can produce elastic after effect, and in the extremely short time, the magnet green compact inside and outside wall that has broken away from the die cavity constraint can outwards expand, thereby influences the dimensional accuracy of magnet.
Summary of the invention
In order to solve the problems of the technologies described above, the utility model provides a kind of mould, can effectively solve the technical barrier that magnet reduces the precision of magnet owing to the internal stress effect in knockout course.
The described rare-earth permanent magnet compression mold of the utility model comprises punch, last punch template, lower punch, lower punch template, die, die template, plug, plug template; Wherein
Last punch is fixedly mounted on the punch template, and lower punch is fixedly mounted on the lower punch template, and the lower punch upper end closely is enclosed within the die; Die is fixedly mounted in the die template, last punch central axis and lower punch central axes, and the plug upper end closely is enclosed within the lower punch; The plug bottom is fixed on the plug template, and the lower punch upper end closely is enclosed within the die die; Lower punch forms die cavity between the plug; Under the original state, the upper surface of plug and the upper surface of die and die installing plate are on same horizontal plane;
Described epirelief film and lower punch are the hollow circular cylinder of band mounting seat, and epirelief film and lower punch diameter, and wall thickness is all identical;
Described plug is made up of two parts, and its lower end is the cylinder of band mount pad, and the upper end also is a cylinder, and the cylindrical radius in upper end is less than the cylindrical radius in lower end.
Further, the difference of plug lower end cylinder radius and plug upper cylinder radius is 0.01mm～0.05mm.
Further, the cylindrical height in plug upper end is for making the height of magnet.
Further, epirelief film template is connected through the decompressor of first T junction and press, and under the control of press decompressor, accomplishes the punching press action.
Further, epirelief film template is connected with the die template through two springs, and the die template is fixedly connected with the plug template through firm post, and the lower punch template is fixedly connected through side plate with the press stand.
Further; The plug template is connected through the stripper apparatus of second T junction and press; And can under the drive of demoulding control device, move up and down; Thereby drive and be fixed on the plug on the plug template, and move up and down, accomplish demoulding action through the die template of firm post with its fixed connection.
Further, the described punch of going up, lower punch, die, the material of plug are carbide alloy.
In the utility model, compare, because the radius at two ends is different about the plug with the plug of prior art; Many extra die cavities between the inner surface of the outer surface of plug upper end and die like this; When magnet in the process of the upwards demoulding, can in this die cavity, carry out internal stress and discharge, so the dimensional accuracy of magnet is guaranteed; Can solve in the prior art, the big difficult problem of magnet tolerance that elastic after effect causes take place owing to the inner internal stress of magnet discharges.
Description of drawings
The generalized section of Fig. 1 the utility model mould structure.
The structure chart of Fig. 2 plug.
The specific embodiment
In order to make those skilled in the art can understand the spirit of the utility model clearer, accurately, elaborate below in conjunction with the specific embodiment of accompanying drawing to the utility model.
Fig. 1 is the sketch map of the mould structure of the utility model specific embodiment, and Fig. 2 is the mandrel structure sketch map of the utility model specific embodiment shown in Figure 1.With reference to figure 1, Fig. 2.
The described mould of the utility model comprises punch 1, last punch template 5, lower punch 3, lower punch template 6, die 2, die template 7, plug 4, plug template 8.Wherein epirelief film 1 is the hollow circular cylinder of being with mounting seat with lower punch 3, and epirelief film 1 and lower punch 3 diameters, and wall thickness is all identical.Wherein go up punch 1 and be fixedly mounted on the punch template 5, lower punch 3 is fixedly mounted on the lower punch template 6, and lower punch 3 upper ends closely are enclosed within the die 2, and die 2 is fixedly mounted in the die template 7, last punch 1 central axis and lower punch 3 central axes; Plug 4 upper ends are enclosed within the lower punch 3, and plug 4 bottoms are fixed on the plug template 8, and lower punch 3 upper ends closely are enclosed within the die 2, die 2, and lower punch 3 forms die cavity between the plug 4; Under the original state, the upper surface of the upper surface of plug 4 and die 2 and the upper surface of die template 7 are on same horizontal plane.
Epirelief film template 5 is connected through the decompressor of first T junction 14 and press, and under the control of press decompressor, accomplishes the punching press action; Epirelief film template 5 is connected with die template 7 through two springs 10, and die template 7 is fixedly connected with plug template 8 through firm post 9.In a concrete embodiment, described firm post has 4, and runs through lower punch template 7.Lower punch template 7 is fixedly connected through pair of side plates 13 with press stand 12.Plug template 8 is connected through the stripper apparatus of second T junction 11 and press; And can under the drive of demoulding control device, move up and down; Thereby drive and be fixed on the plug 4 on the plug template 8, and move up and down, accomplish demoulding action through the die template 7 of firm post 9 with its fixed connection.
Special; With reference to figure 2, the described plug of the utility model is made up of two parts, and its lower end is the cylinder 4b of band mount pad; The upper end also is a cylinder 4a; Wherein, the radius r of plug upper end cylinder 4a is less than the radius R of plug lower end cylinder 4b, and the height H of plug upper end cylinder 4a is the height of manufacturing magnet.
Preferably; The difference of plug lower end cylinder radius R and plug upper cylinder radius r is 0.01mm～0.05mm; Concrete numerical value by produce magnet required reach precision determined; If the dimensional accuracy that magnet requires is high, then the difference of plug lower end cylinder radius R and upper cylinder radius r is just little.In a concrete embodiment, the dimensional tolerance of magnet is controlled to be ± 0.01mm, and then the difference of plug lower end cylinder radius R and plug upper end cylinder radius r is 0.01mm, and is corresponding, makes the time of these magnet green compact and will extend.In another specific embodiment, the dimensional tolerance of magnet is controlled to be ± 0.05mm, and then the difference of plug lower end cylinder radius R and plug upper end cylinder radius r is 0.05mm, and the manufacturing time of these magnet green compact will shorten.
Special, the height H of upper end cylinder 4a is identical with the height of manufacturing magnet.
In order to guarantee the service life of mould, the critical piece of the said mould of the utility model such as epirelief film 1, die 2, lower punch 3, the material of plug 4 is carbide alloy, in concrete embodiment, is preferably the wolfram steel in the carbide alloy series.
The described mould of the utility model is work like this.Press adds powder box and under the control of press, magnetic is joined die, and plug in the die cavity that lower punch forms, is accomplished the filling action.Add the powder box recession, the epirelief film enters into die cavity downwards under the drive of press decompressor, the magnetic in the die cavity is pressed into circular magnet green compact, accomplishes the compacting action.The epirelief film moves up; Simultaneously; The stripper apparatus of press drives the plug template through second T junction and moves down, and is fixed on the plug on the plug template thereby drive, and moves down with the die template that the plug template is fixedly connected through 4 firm posts; The magnet green compact are ejected from die cavity by lower punch, accomplish demoulding action.
In the utility model, compare, because the radius at two ends is different about the plug with the plug of prior art; Many extra die cavities between the inner surface of the outer surface of plug upper end and die like this; When magnet in the process of the upwards demoulding, can in this die cavity, carry out internal stress and discharge, so the dimensional accuracy of magnet is guaranteed; Can solve in the prior art, the big difficult problem of magnet tolerance that elastic after effect causes take place owing to the inner internal stress of magnet discharges.
It is understandable that the detailed description of the foregoing description is in order to set forth and explain the principle of the utility model rather than to the qualification of the protection domain of the utility model.Under the prerequisite of the purport that does not break away from the utility model, one of ordinary skill in the art can be made modification through the understanding to the principle that is disclosed of technique scheme on these embodiment bases, changes and changes.Therefore the protection domain of the utility model appended claim with and be equal to and limit.
Claims (7)
1. a rare-earth permanent magnet compression mold comprises punch, last punch template, lower punch, lower punch template, die, die template, plug, plug template;
Wherein go up punch and be fixedly mounted on the punch template, lower punch is fixedly mounted on the lower punch template, and the lower punch upper end closely is enclosed within the die; Die is fixedly mounted in the die template, last punch central axis and lower punch central axes, and the plug upper end closely is enclosed within the lower punch; The plug bottom is fixed on the plug template, and the lower punch upper end closely is enclosed within the die die; Lower punch forms die cavity between the plug; Under the original state, the upper surface of plug and the upper surface of die and die installing plate are on same horizontal plane;
Described epirelief film and lower punch are the hollow circular cylinder of band mounting seat, and epirelief film and lower punch diameter, and wall thickness is all identical;
It is characterized in that described plug is made up of two parts, its lower end is the cylinder of band mount pad, and the upper end also is a cylinder, and the cylindrical radius in upper end is less than the cylindrical radius in lower end.
2. rare-earth permanent magnet compression mold as claimed in claim 1 is characterized in that, the difference of plug lower end cylinder radius and plug upper cylinder radius is 0.01mm～0.05mm.
3. according to claim 1 or claim 2 rare-earth permanent magnet compression mold is characterized in that, the cylindrical height in plug upper end is for making the height of magnet.
4. rare-earth permanent magnet compression mold as claimed in claim 1 is characterized in that, epirelief film template is connected through the decompressor of first T junction and press, and under the control of press decompressor, accomplishes the punching press action.
5. rare-earth permanent magnet compression mold as claimed in claim 1; It is characterized in that; Epirelief film template is connected with the die template through two springs, and the die template is fixedly connected with the plug template through firm post, and the lower punch template is fixedly connected through side plate with the press stand.
6. rare-earth permanent magnet compression mold as claimed in claim 1; It is characterized in that; The plug template is connected through the stripper apparatus of second T junction and press, and can under the drive of demoulding control device, move up and down, and is fixed on the plug on the plug template thereby drive; And move up and down through the die template of firm post with its fixed connection, accomplish demoulding action.
7. rare-earth permanent magnet compression mold as claimed in claim 1 is characterized in that, the described punch of going up, and lower punch, die, the material of plug are carbide alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205379660U CN202411413U (en) | 2011-12-20 | 2011-12-20 | Rare earth permanent magnet compression forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205379660U CN202411413U (en) | 2011-12-20 | 2011-12-20 | Rare earth permanent magnet compression forming die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202411413U true CN202411413U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205379660U Expired - Fee Related CN202411413U (en) | 2011-12-20 | 2011-12-20 | Rare earth permanent magnet compression forming die |
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| CN (1) | CN202411413U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847938A (en) * | 2012-10-07 | 2013-01-02 | 江西金力永磁科技有限公司 | Magnetic material powder forming mold |
| CN103447527A (en) * | 2013-08-07 | 2013-12-18 | 宁波韵升股份有限公司 | Magnet forming die |
| CN103706788A (en) * | 2013-12-31 | 2014-04-09 | 昆山优磁电子有限公司 | EP type magnetic core die |
| CN103706789A (en) * | 2013-12-31 | 2014-04-09 | 昆山优磁电子有限公司 | Simple RH type magnetic core die |
| CN105666662A (en) * | 2016-01-25 | 2016-06-15 | 嘉善县天成强磁有限责任公司 | Annular ferrite full-automatic slip casting mold |
-
2011
- 2011-12-20 CN CN2011205379660U patent/CN202411413U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847938A (en) * | 2012-10-07 | 2013-01-02 | 江西金力永磁科技有限公司 | Magnetic material powder forming mold |
| CN102847938B (en) * | 2012-10-07 | 2014-07-02 | 江西金力永磁科技有限公司 | Magnetic material powder forming mold |
| CN103447527A (en) * | 2013-08-07 | 2013-12-18 | 宁波韵升股份有限公司 | Magnet forming die |
| CN103706788A (en) * | 2013-12-31 | 2014-04-09 | 昆山优磁电子有限公司 | EP type magnetic core die |
| CN103706789A (en) * | 2013-12-31 | 2014-04-09 | 昆山优磁电子有限公司 | Simple RH type magnetic core die |
| CN105666662A (en) * | 2016-01-25 | 2016-06-15 | 嘉善县天成强磁有限责任公司 | Annular ferrite full-automatic slip casting mold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 201807 No. 3210 Chengbei Road, Shanghai, Jiading District Patentee after: SHANGHAI SAN HUAN MAGNETICS CO., LTD. Patentee after: Beijing Zhongke Sanhuan High-Tech Co., Ltd. Address before: 201800 No. 3210 Chengbei Road, Shanghai, Jiading District Patentee before: Shanghai Epson Magnetics Co., Ltd. Patentee before: Beijing Zhongke Sanhuan High-Tech Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20181220 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |