CN109465453A - A kind of binding rare earth permanent magnet injection mo(u)lding method - Google Patents
A kind of binding rare earth permanent magnet injection mo(u)lding method Download PDFInfo
- Publication number
- CN109465453A CN109465453A CN201811643831.5A CN201811643831A CN109465453A CN 109465453 A CN109465453 A CN 109465453A CN 201811643831 A CN201811643831 A CN 201811643831A CN 109465453 A CN109465453 A CN 109465453A
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- China
- Prior art keywords
- injection
- mold
- magnet
- permanent magnet
- rare earth
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/0533—Alloys characterised by their composition containing rare earth metals in a bonding agent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0293—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a kind of binding rare earth permanent magnet injection mo(u)lding methods, reserve the reserved space in addition to space needed for product own form when molding in the type chamber of injection mold；The magnetic material of melting is first filled with to the type chamber of entire injection mold, and by carrying out second-compressed to magnetic material in a molten state in magnet injection moulding process, the stomata and vacuum hole generated in magnet injection moulding process is squeezed, exclusion excessive gas is simultaneously real by magnet densification.Injection injection molding forming method provided by the invention can substantially reduce the ratio that shaped magnet interior porosity occurs in bonded permanent magnet injection moulding process.
Description
Technical field
The present invention relates to bonded permanent magnet forming methods.
Background technique
Binding electromagnetic material can be divided into anisotropic bond ferrite according to magnetism of material energy difference and isotropic is viscous
Tie neodymium iron boron；Bonded permanent magnet can be divided into compression magnet according to the difference of moulding process, squeeze out magnet, injection molded magnets & calendering
Magnet etc..
Injection molded magnets can be made any complicated shape part, and injection molded magnets since shape and structure does not have limitation
It is plastic that one can also be completed with other metalworks or plastic part, so being widely used in auto industry field, such as various types of
The vehicle-mounted angular transducer magnet of type, velocity sensor, water pump rotor, oil Pump rotor etc..
Injection molded magnets material is kneaded by Magnaglo and plastic adhesive are compound, and wherein Magnaglo weight ratio accounts for about
85% or more, the weight ratio of plastic adhesive only has about 10% or so.So injection molded magnets material is different from general injection-moulded plastic,
The mobility of magnetic material is more far short of what is expected than generic engineering plastics, and injection molding Packing character is very poor；Therefore in some structures of injection molding
Complexity, when wall thickness thicker product, are easy to appear insufficient fill, and interiors of products has a large amount of stomatas when general magnet wall thickness > 4mm
Occur.In addition when subassembly product in injection molding with metal insert, due to asking for metal insert and filler temperature difference
It is high that topic is also easy to happen magnet inner air vent rate.
This defect limits the shape of product (magnet wall thickness cannot be too thick) of bonded permanent magnet, and permanent magnet is existed
Failure risk when being applied to some structural members in automobile greatly increases, such as some powerful pump class rotor applications.
Summary of the invention
There is a problem of that magnet inner air vent rate is high for existing bonded permanent magnet injection molding scheme, needs a kind of new glue
Tie permanent magnet injection molding scheme.
For this purpose, this method can be significantly the purpose of the present invention is to provide a kind of binding rare earth permanent magnet injection mo(u)lding method
Reduce the porosity in bonded permanent magnet injection moulding process.
In order to achieve the above object, a kind of binding rare earth permanent magnet injection mo(u)lding method provided by the invention, comprising:
The reserved space in addition to space needed for product own form is reserved when molding in the type chamber of injection mold；
The magnetic material of melting is first filled with to the type chamber of entire injection mold, and by right in magnet injection moulding process
Magnetic material in a molten state carries out second-compressed, squeezes the stomata and vacuum hole generated in magnet injection moulding process, excludes
Excessive gas is simultaneously real by magnet densification.
Further, the forming method is in injection mould closing, so that the preceding mould in injection mold and between rear mold
Reserve certain gap.
Further, the gap size is between 0.1mm-0.3mm.
Further, the process of progress second-compressed includes: in magnet injection moulding process in the forming method
1) injection molding machine middling speed injection, and while injection molding machine injection, it is synchronous to close tight mold, to the magnetism in mold cavity
Material carries out the first second compression；
2) enter state of pressure keeping, simultaneously by thimble in mold to the intracavitary jacking certain distance of type in pressure maintaining period, with right
The intracavitary magnetic material of type has carried out the second compression.
Further, the forming method further include:
Product cools and solidifies in mold cavity after pressure maintaining；
Mold is opened, ejecting product, completes demoulding.
Injection injection molding forming method provided by the invention by magnet injection moulding process to magnetism in a molten state
Material carries out two second compressions, thus squeezes the stomata and vacuum hole that generate in magnet injection moulding process, excludes excessive gas and simultaneously will
Magnet densification is real, to substantially reduce the ratio that shaped magnet interior porosity occurs in bonded permanent magnet injection moulding process.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is conventional injection moulding process schematic diagram；
Fig. 2 is the process schematic of injection injection molding in present example；
Fig. 3 is the enlarged diagram of part A in Fig. 2；
Fig. 4 is the detection example figure that conventional Shooting Technique forms product.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
It is well known that the shape of type chamber and shaped article in conventional magnet injection molding process in injection mold has needed
It is complete consistent, and in injection molding, it needs completely to close injection mold tight.
In this way, the magnet injection molding process process of conventional ripening is following (referring to Fig. 1):
A. mould 10, rear mold 20 mold conjunction completely tightly before injection mold；
B. the quick injection of injection molding machine, the usual injection time is between 0.5s-1.0s；
C. screw in injection molding machine enters state of pressure keeping, and the usual dwell time is between 1s-2s；
D. product cools and solidifies in mold cavity after pressure maintaining；
E. mold is opened；
F. 30 ejecting product of injection molding machine ejecting mechanism, demoulding are completed.
By the obtained product of the injection moulding process of above-mentioned conventional ripening, product wall thickness > can detecte out by CT scan
The magnet internal porosity incidence of 4mm is probably between 1%-1.5%.This largely effects on the performance of product, increases this kind of product
The risk to fail in use.
For the high problem of magnet internal porosity incidence, this example prepares bonding using injection injection molding forming method forever
Magnet, and can be good at solving the problems of conventional magnet injection molding process.
This injection injection molding forming method, by reserving in the type chamber of injection mold except space needed for product own form
Except reserved space；I.e. so that the type chamber in injection mold includes molding space corresponding to product own form and corresponding
Reserved space outside beyond molding space can carry out the volume size of the reserved space according to product own form size
Adjustment.
On this basis, the magnetic material of melting is allowed first to be filled with the type chamber of entire injection mold first；Then by
Two second compressions are carried out to magnetic material in a molten state in magnet injection moulding process, squeeze the gas generated in magnet injection moulding process
Hole and vacuum hole, exclusion excessive gas is simultaneously real by magnet densification, to reach the ratio that magnet interior porosity occurs that reduces.
Referring to fig. 2, this example realizes that injection injection molding forming method implementation process is as follows:
A. mould, rear mold molding before injection mold, but mold does not conform to tightly, reserves between 0.1mm-0.3mm between the mould of front and back
Gap H, so that the space of the certain volume in addition to product own form is reserved in the type chamber of injection mold, to the gap
Neglect the shape size of product greatly depending on.
On this basis, the thimble length in this injection mold is relative to the short 0.1- of thimble length in conventional mould
Thus 0.5mm reserves volumetric spaces (as shown in Figure 3) for injection process.
B. for the injection mold in step (a), injection molding machine middling speed injection, the usual injection time between 1.0s-2.0s,
While injection molding machine injection, sandwich mold unit slowly closes tight mold.At this time since there are gaps between mold, so that being emitted directly toward
The intracavitary material volume of type is greater than product own vol；Mold is synchronous while injection closes tightly, thus the magnetism intracavitary to type
Material carries out the first second compression.
C. screw in injection molding machine enters state of pressure keeping, the dwell time at this time about between 2s-4s, in screw in injection molding machine pressure maintaining
While, ejecting mechanism slowly by die ejector pin to the intracavitary jacking certain distance about 0.1mm-0.5mm of type, and practical jacking away from
From neglect shape size and the thimble quantity of product greatly depending on.Since the intracavitary magnetic material of entire pressure maintaining period type is still located
In semi-molten state, so then realizing that the magnetic material intracavitary to type carries out second from opposite direction jacking thimble while pressure maintaining
Compression.
D. product cools and solidifies in mold cavity after pressure maintaining；
E. mold is opened；
F. injection molding machine ejecting mechanism ejecting product, demoulding are completed.
In this injection injection molding forming method, by the compression twice in injection injection moulding process, can effectively it exclude
Residual gas inside magnet, by inside magnet stomata and vacuum hole incidence control below 0.2%.
In real process, full servo-electric injection moulding machine can be used to realize this method in this injection injection molding forming method
In synchronous compression twice movement.
Illustrate this programme below by way of a specific application example.
Example 1
This example is directed to a vehicle electronics water pump PM rotor, bonds iron oxygen by graphite material bearing 50 and PPS
Body ontology 60 forms (as shown in Figure 4).
Referring to fig. 4, the geometric dimension of the PM rotor are as follows:Product wall thickness t=
7mm。
Production process is that the graphite bearing 50 that will have been machined is put into injection molding PM rotor in mold as inserts.
This example produces the PM rotor according to usual magnet Shooting Technique (as detailed above), and sets injection molding
Technological parameter is as follows:
Injection pressure 130bar；Melt 330 DEG C of glue temperature；
Dwell pressure 55bar；160 DEG C of mold temperature；
Monitor injection process parameter:
Injection time 0.8s；Cooling time 30s
Dwell time 1.5s.
Geometric dimension, the satisfactory PM rotor of magnetic characteristic can be formed accordingly.
For the PM rotor, finds that inside exists compared with gross blow hole after being crushed, pass through CT scan quantity-produced 50pcs
Sample, porosity average level occur position and concentrate 1.4% or so, mostly flow corner 70 in product thick-wall materials.
Example 2
This example for the vehicle electronics water pump PM rotor being related in example 1, infuse by the injection that this patent provides
Forming method production (as detailed above) is moulded, it is as follows to concurrently set molding proces s parameters:
Injection pressure 130bar；Melt 330 DEG C of glue temperature；
Dwell pressure 55bar；160 DEG C of mold temperature；
Monitor injection process parameter:
Injection time 1.5s；Cooling time 30s；
Dwell time 2.5s.
The PM rotor that can be formed accordingly, geometric dimension, magnetic characteristic meet the requirements suitable with normal process.
Meanwhile stomata is visually hardly visible after crushed product, by CT scan quantity-produced 50pcs sample,
Stomata incidence average level is 0.08% or so.
By upper two example it is found that the permanent magnet of the complicated shape for wall thickness, same material, under same process conditions
It can effectively be dropped under the premise of guaranteeing that other characteristics of product are constant using injection injection molding forming method provided by this patent
Low magnet internal porosity incidence.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of binding rare earth permanent magnet injection mo(u)lding method characterized by comprising
The reserved space in addition to space needed for product own form is reserved when molding in the type chamber of injection mold；
The magnetic material of melting is first filled with to the type chamber of entire injection mold, and by magnet injection moulding process to being in
The magnetic material of molten condition carries out second-compressed, squeezes the stomata and vacuum hole generated in magnet injection moulding process, and it is extra to exclude
Gas is simultaneously real by magnet densification.
2. a kind of binding rare earth permanent magnet injection mo(u)lding method according to claim 1, which is characterized in that the molding side
Method is in injection mould closing, so that the preceding mould in injection mold and reserving certain gap between rear mold.
3. a kind of binding rare earth permanent magnet injection mo(u)lding method according to claim 2, which is characterized in that the gap is big
It is small between 0.1mm-0.3mm.
4. a kind of binding rare earth permanent magnet injection mo(u)lding method according to claim 1, which is characterized in that the molding side
The process of progress second-compressed includes: in magnet injection moulding process in method
1) injection molding machine middling speed injection, and while injection molding machine injection, it is synchronous to close tight mold, to the magnetic material in mold cavity
Carry out the first second compression；
2) enter state of pressure keeping, simultaneously by thimble in mold to the intracavitary jacking certain distance of type in pressure maintaining period, to type chamber
Interior magnetic material has carried out the second compression.
5. a kind of binding rare earth permanent magnet injection mo(u)lding method according to claim 4, which is characterized in that the molding side
Method further include:
Product cools and solidifies in mold cavity after pressure maintaining；
Mold is opened, ejecting product, completes demoulding.
Priority Applications (1)
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|---|---|---|---|
| CN201811643831.5A CN109465453A (en) | 2018-12-29 | 2018-12-29 | A kind of binding rare earth permanent magnet injection mo(u)lding method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811643831.5A CN109465453A (en) | 2018-12-29 | 2018-12-29 | A kind of binding rare earth permanent magnet injection mo(u)lding method |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210062A (en) * | 1997-07-11 | 1999-03-10 | 爱华株式会社 | Mold for injection molding |
| CN1986186A (en) * | 2005-12-23 | 2007-06-27 | 深圳富泰宏精密工业有限公司 | Mold air exhausting structure and mold structure using it |
| JP2007160580A (en) * | 2005-12-12 | 2007-06-28 | Nissan Motor Co Ltd | Injection molding method and mold structure for injection molding |
| CN101138871A (en) * | 2006-09-04 | 2008-03-12 | 株式会社名机制作所 | Mold clamping device |
| CN101417498A (en) * | 2008-10-27 | 2009-04-29 | 朱兴源 | Low-cost manufacture method of high-quality diaphragm and filter plate |
| CN204095074U (en) * | 2014-09-23 | 2015-01-14 | 深圳市鑫灏源电子科技实业有限公司 | The exhaust apparatus of injection mold |
| CN106994772A (en) * | 2017-05-15 | 2017-08-01 | 江苏鑫蕴模塑科技有限公司 | A kind of mould with SAPMAC method system |
| CN207736678U (en) * | 2018-01-17 | 2018-08-17 | 东莞市旭敦五金塑胶制品有限公司 | A kind of injection mold improving injection molding precision |
| CN108608620A (en) * | 2018-05-09 | 2018-10-02 | 深圳市南极光电子科技有限公司 | A kind of V-cut forming light guide plates method and V-cut light guide plate forming moulds |
-
2018
- 2018-12-29 CN CN201811643831.5A patent/CN109465453A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1210062A (en) * | 1997-07-11 | 1999-03-10 | 爱华株式会社 | Mold for injection molding |
| JP2007160580A (en) * | 2005-12-12 | 2007-06-28 | Nissan Motor Co Ltd | Injection molding method and mold structure for injection molding |
| CN1986186A (en) * | 2005-12-23 | 2007-06-27 | 深圳富泰宏精密工业有限公司 | Mold air exhausting structure and mold structure using it |
| CN101138871A (en) * | 2006-09-04 | 2008-03-12 | 株式会社名机制作所 | Mold clamping device |
| CN101417498A (en) * | 2008-10-27 | 2009-04-29 | 朱兴源 | Low-cost manufacture method of high-quality diaphragm and filter plate |
| CN204095074U (en) * | 2014-09-23 | 2015-01-14 | 深圳市鑫灏源电子科技实业有限公司 | The exhaust apparatus of injection mold |
| CN106994772A (en) * | 2017-05-15 | 2017-08-01 | 江苏鑫蕴模塑科技有限公司 | A kind of mould with SAPMAC method system |
| CN207736678U (en) * | 2018-01-17 | 2018-08-17 | 东莞市旭敦五金塑胶制品有限公司 | A kind of injection mold improving injection molding precision |
| CN108608620A (en) * | 2018-05-09 | 2018-10-02 | 深圳市南极光电子科技有限公司 | A kind of V-cut forming light guide plates method and V-cut light guide plate forming moulds |
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Application publication date: 20190315 |