CN201900265U - Forming die for improving coaxiality of inner and outer diameters of sintered NdFeB circular ring - Google Patents

Forming die for improving coaxiality of inner and outer diameters of sintered NdFeB circular ring Download PDF

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Publication number
CN201900265U
CN201900265U CN2010206373582U CN201020637358U CN201900265U CN 201900265 U CN201900265 U CN 201900265U CN 2010206373582 U CN2010206373582 U CN 2010206373582U CN 201020637358 U CN201020637358 U CN 201020637358U CN 201900265 U CN201900265 U CN 201900265U
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CN
China
Prior art keywords
punch die
punching die
die
annulus
upper plate
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Expired - Fee Related
Application number
CN2010206373582U
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Chinese (zh)
Inventor
何卫阳
李云龙
舒阳会
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Hunan Aerospace Magnet and Magneto Co Ltd
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Hunan Aerospace Magnet and Magneto Co Ltd
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Priority to CN2010206373582U priority Critical patent/CN201900265U/en
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Publication of CN201900265U publication Critical patent/CN201900265U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a forming die for improving the coaxiality of inner and outer diameters of a sintered NdFeB circular ring, which comprises a left punching die, a right punching die, a rear lateral plate, a front lateral plate, a bottom plate, an upper plate, a center pole, a left pressure transmission block and a right pressure transmission block. In the forming process, the left punching die, the right punching die, the rear lateral plate, the front lateral plate, the bottom plate, the upper plate and the center pole are sealed into a circular ring forming cavity. The bottom plate and the upper plate are made of high permeability steel and other components are made of low permeability metal. The bottom plate at both sides of the left punching die and the right punching die is provided with 2 to 4 eudipleural positioning bolts. In the utility model, when the forming die is in a charging state, the left punching die and the right punching die are respectively pressed against the left and right positioning bolts to realize position limit of the left punching die and the right punching die and make the left and right parts of the forming cavity symmetrical, so that the coaxiality of the inner and outer diameters of the circular ring is improved. The forming die is beneficial for reducing grinding processing allowance, shortening the grinding processing time and reducing the production cost.

Description

A kind of mould that improves external diameter axiality in the sintered NdFeB annulus
Technical field
The utility model relates to a kind of mould of sintered NdFeB annulus.
Background technology
The sintered NdFeB annulus is mainly used in the electro-acoustic element, at present the common technological process of production is: static pressure → vacuum-sintering → mill processing → electroplating surface such as raw material → vacuum melting → suction hydrogen fragmentation → air-flow abrasive dust → pressing under magnetic field → wait, after the pressing under magnetic field operation, the annulus blank is able to moulding, and the height of external diameter axiality has bigger influence to the follow-up mill processing cost in back in the annulus blank.Number of patent application is neodymium-iron-boron cylindrical form permanent magnetic material forming method and the particular manufacturing craft that 200710071571.4 document discloses the band longitudinal hole, the product of producing is the sintered NdFeB annulus, it is the Magnetic field press of above-below direction that this technology adopts pressing direction, the reinforced earlier semicircle that suppresses, reinforced again, suppress other semicircle, obtain the annulus of complete body at last, the whole operation more complicated, there is density variation in other twice compacting, causes the coaxiality deviation of the endoporus of product annulus behind oversintering and external diameter bigger.Released the Magnetic field press that a kind of pressing direction is a left and right directions in the industry in the recent period in addition, can realize once the reinforced annulus that suppresses, its supporting mould comprises left punch die, right punch die, back side panel, front side board, base plate, upper plate, newel, left side pressure transmission piece, right pressure transmission piece, left side punch die during moulding, right punch die, back side panel, front side board, base plate, upper plate and newel sealing are the annulus forming cavity, Nd-Fe-B powder is in the forming cavity, the left side of Magnetic field press, the pressure that right oil cylinder produces is passed to the pressure transmission piece, punch die, thereby realize compacting to material powder in the forming cavity, after compacting finishes, move on the upper plate, extract newel then, take back side panel and front side board apart, remove left punch die and right punch die, thereby obtained neodymium iron boron annulus blank, this technology has been simplified the moulding difficulty of annulus greatly, be a kind of more advanced technology, but the shortcoming of this technology is the initial position of reinforced stage left side punch die and right punch die to be determined by range estimation, cause a forming cavity left side easily, right size is asymmetric, and then influences the interior external diameter axiality of annulus blank.
The utility model content
The purpose of this utility model is to provide a kind of mould that improves external diameter axiality in the sintered NdFeB annulus, the inside and outside footpath of the sintered NdFeB annulus blank axiality that adopts this mould molding to come out is higher, reduces production costs thereby helping reducing grinds allowance, shorten the mill machining period.
The technical solution of the utility model is, comprise left punch die, right punch die, back side panel, front side board, base plate, upper plate, newel, left pressure transmission piece, right pressure transmission piece, left side punch die, right punch die, back side panel, front side board, base plate, upper plate and newel sealing are the annulus forming cavity during moulding, base plate and upper plate are the high magnetic permeability steel, miscellaneous part is the low magnetic permeability metal, it is characterized in that, on the base plate of left punch die and right punch die both sides, be provided with a symmetrical 2-4 pilot pin.
Described low magnetic permeability metal is meant that maximum relative permeability is in the metal between 1.0 ~ 1.1, as magnetism-free stainless steel, non-magnesium hard alloy, no magnetic potassium steel, copper, aluminium, copper alloy or aluminium alloy etc.
Described high magnetic permeability steel is meant that maximum relative permeability is greater than 200 carbon steel.
The beneficial effects of the utility model: when mould is in the state of feeding in raw material, left side punch die leans on left and right pilot pin respectively mutually with right punch die, the position of realizing left punch die and right punch die limits, make the forming cavity left-right symmetry, thereby the inside and outside footpath of annulus axiality is improved, helps reducing mill allowance, shorten the mill machining period, reduce production costs.
Description of drawings
Fig. 1 is the main pseudosection of embodiment 1;
Fig. 2 is the reinforced vertical view of state during the initial stage for embodiment 1 is in;
Fig. 3 is the main pseudosection of embodiment 2;
Fig. 4 is the reinforced vertical view of state during the initial stage for embodiment 2 is in.
The specific embodiment
Embodiment 1: see figures.1.and.2:
Present embodiment comprises left punch die 1, right punch die 2, back side panel 3, front side board 4, base plate 5, upper plate 6, newel 7, left pressure transmission piece 8, right pressure transmission piece 9.On the base plate 5 of left punch die 1, right punch die 2 both sides, be provided with 4 pilot pins 10 altogether.
The course of work of the present utility model is as follows: in the groove on back side panel 3 and the front side board 4 insertion base plates 5, then that left punch die 1 is relative with right punch die 2 concave surfaces, insert respectively in the relative gap of back side panel 3 and front side board 4, the back side of left side punch die 1 and right punch die 2 is respectively near left pilot pin and pilot pin, left side punch die 1, right punch die 2, back side panel 3, front side board 4, base plate 5, upper plate 6 and newel 7 sealings are the annulus forming cavity, and NdFeB magnetic powder is in the forming cavity.The pressure that the left and right oil cylinder of Magnetic field press produces is passed to pressure transmission piece, punch die, thereby realizes the compacting to material powder in the forming cavity, after compacting finishes, move on the upper plate 6, extract newel 7 then, take back side panel 3 and front side board 4 apart, remove left punch die 3 and right punch die 4, obtain neodymium iron boron annulus blank.Because pilot pin 10 defines the initial position of left punch die 1 and right punch die 2, ensured the left-right symmetry degree of forming cavity, thereby the external diameter axiality is higher in the neodymium iron boron annulus blank that obtains, blank after vacuum-sintering in the external diameter axiality can reach in the 0.3mm, greatly reduce the mill difficulty of processing.
Embodiment 2:
With reference to Fig. 3 and Fig. 4:
Present embodiment is as different from Example 1: be provided with 2 pilot pins 10 altogether on the base plate 5 of left punch die 1, right punch die 2 both sides.
The course of work of the present utility model is as follows: in the groove on back side panel 3 and the front side board 4 insertion base plates 5, then that left punch die 1 is relative with right punch die 2 concave surfaces, insert respectively in the relative gap of back side panel 3 and front side board 4, the back side of left side punch die 1 and right punch die 2 is respectively near left pilot pin and pilot pin, left side punch die 1, right punch die 2, back side panel 3, front side board 4, base plate 5, upper plate 6 and newel 7 sealings are the annulus forming cavity, NdFeB magnetic powder is in the forming cavity, the left side of Magnetic field press, the pressure that right oil cylinder produces is passed to the pressure transmission piece, punch die, thereby realize compacting to material powder in the forming cavity, after compacting finishes, move on the upper plate 6, extract newel 7 then, take back side panel 3 and front side board 4 apart, remove left punch die 3 and right punch die 4, obtain neodymium iron boron annulus blank.Because pilot pin 10 defines the initial position of left punch die 1 and right punch die 2, ensured the left-right symmetry degree of forming cavity, thereby the external diameter axiality is higher in the neodymium iron boron annulus blank that obtains, blank after vacuum-sintering in the external diameter axiality can reach in the 0.4mm, greatly reduce the mill difficulty of processing.

Claims (3)

1. mould that improves external diameter axiality in the sintered NdFeB annulus, comprise left punch die, right punch die, back side panel, front side board, base plate, upper plate, newel, left pressure transmission piece, right pressure transmission piece, left side punch die, right punch die, back side panel, front side board, base plate, upper plate and newel sealing are the annulus forming cavity during moulding, base plate and upper plate are the high magnetic permeability steel, miscellaneous part is the low magnetic permeability metal, it is characterized in that, on the base plate of left punch die and right punch die both sides, be provided with a symmetrical 2-4 pilot pin.
2. a kind of mould that improves external diameter axiality in the sintered NdFeB annulus according to claim 1, it is characterized in that, described low magnetic permeability metal is meant that maximum relative permeability is in the metal between 1.0 ~ 1.1, and described metal is magnetism-free stainless steel, non-magnesium hard alloy, no magnetic potassium steel, copper, aluminium, copper alloy or aluminium alloy.
3. a kind of mould that improves external diameter axiality in the sintered NdFeB annulus according to claim 1 is characterized in that, described high magnetic permeability steel is meant that maximum relative permeability is greater than 200 carbon steel.
CN2010206373582U 2010-12-02 2010-12-02 Forming die for improving coaxiality of inner and outer diameters of sintered NdFeB circular ring Expired - Fee Related CN201900265U (en)

Priority Applications (1)

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CN2010206373582U CN201900265U (en) 2010-12-02 2010-12-02 Forming die for improving coaxiality of inner and outer diameters of sintered NdFeB circular ring

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Application Number Priority Date Filing Date Title
CN2010206373582U CN201900265U (en) 2010-12-02 2010-12-02 Forming die for improving coaxiality of inner and outer diameters of sintered NdFeB circular ring

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CN201900265U true CN201900265U (en) 2011-07-20

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102873327A (en) * 2012-10-05 2013-01-16 广西梧州港德硬质合金制造有限公司 Rubidium, iron and boron magnetic steel forming mold
CN103084577A (en) * 2013-02-07 2013-05-08 哈尔滨工业大学 Device and method for step type hot extrusion preparation of Nd-phase-rich Nd2Fe14B/alpha-Fe permanent magnet
CN104607634A (en) * 2015-01-22 2015-05-13 包头市金蒙汇磁材料有限责任公司 Machining method for inner hole and outer circle of annular rare-earth permanent magnet and special device
CN109470542A (en) * 2018-10-19 2019-03-15 上海传输线研究所(中国电子科技集团公司第二十三研究所) A kind of complex permeability test sampling die and application method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102873327A (en) * 2012-10-05 2013-01-16 广西梧州港德硬质合金制造有限公司 Rubidium, iron and boron magnetic steel forming mold
CN103084577A (en) * 2013-02-07 2013-05-08 哈尔滨工业大学 Device and method for step type hot extrusion preparation of Nd-phase-rich Nd2Fe14B/alpha-Fe permanent magnet
CN103084577B (en) * 2013-02-07 2014-10-08 哈尔滨工业大学 Device and method for step type hot extrusion preparation of Nd-phase-rich Nd2Fe14B/alpha-Fe permanent magnet
CN104607634A (en) * 2015-01-22 2015-05-13 包头市金蒙汇磁材料有限责任公司 Machining method for inner hole and outer circle of annular rare-earth permanent magnet and special device
CN109470542A (en) * 2018-10-19 2019-03-15 上海传输线研究所(中国电子科技集团公司第二十三研究所) A kind of complex permeability test sampling die and application method
CN109470542B (en) * 2018-10-19 2021-04-16 上海传输线研究所(中国电子科技集团公司第二十三研究所) Complex permeability test sample preparation mold and application method

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C14 Grant of patent or utility model
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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110720

Termination date: 20141202

EXPY Termination of patent right or utility model