CN107756749A - A kind of method for improving the injection molded magnets degree of orientation - Google Patents
A kind of method for improving the injection molded magnets degree of orientation Download PDFInfo
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- CN107756749A CN107756749A CN201610707646.2A CN201610707646A CN107756749A CN 107756749 A CN107756749 A CN 107756749A CN 201610707646 A CN201610707646 A CN 201610707646A CN 107756749 A CN107756749 A CN 107756749A
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- mould
- magnetic
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- orientation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/7207—Heating or cooling of the moulded articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a kind of method for improving the injection molded magnets degree of orientation.Including such as lower component：Injection mold, mould bases, equipment for cooling die, mold heating device and magnetic field orientating field.The principle and operating procedure being related to are as follows：Magnetic plastics melt through melt injection enter die cavity when, mold temperature is heated rapidly to the melting temperature of plastic substrate, magnetic plastics is in molten condition, reaches and be rapidly filled with mold cavity；Meanwhile at high temperature, for the material that coercive force temperature coefficient is negative temperature coefficient, such as neodymium iron boron, samarium iron nitrogen, high temperature advantageously reduces magnetic coercivity, and the magnet degree of orientation can be improved under relatively low alignment magnetic field；After mold filling orientation to be done, mold heating device is closed, quickly cooling device is opened, makes mold temperature rapid decrease, make magnetic plastics melt cooling curing molding, magnetic coercivity returns to original level again, and product is taken out in then die sinking；Obtain height-oriented magnet.
Description
Technical field：A kind of method quickly heated the present invention relates to injection mold, cooled down, more particularly to one kind are applied to
In the method that injection molding process improves the magnetic degree of orientation in magnetic plastics.Quick cooling heating mould is applied to injection magnetic aligning
Magnetization process, mold temperature is improved in injection moulding process, improve the mobility of melt and reduce the coercivity of magnetic, be advantageous to improve
The degree of orientation of magnet.
Background technology：Traditional upper magnet is prepared by the method or molding bonded method of sinter molding, though
Right magnetic property is high, but the not sophisticated product of easy-formation labyrinth.As plastic processing technology and mould are orientated the technology that magnetizes
Progress, increasing magnet using injection molding method prepare.Compared to sintering method, the method system of injection molding is utilized
Standby magnet has：The advantages of product size precision is high, and mechanical strength is good, and the complicated easy multipole of shape of product is orientated, production efficiency is high,
The requirement that electronic apparatus and household electrical appliance develop towards directions such as " small, portable, energy-conservations " can be met, obtained in recent years quick
Development.
Although the technique of injection molding, which prepares magnet, has the advantages of more, however, be molded magnetic property it is low be one most
Big problem.Injection molded magnets magnetic property power mainly has several respects reason：The coercivity of magnetic used in magnetic plastics in itself, shape
Looks, granularity, the power of mobility and mould alignment magnetic field.Wherein, the magnetic coercivity of magnetic plastics is lower, magnetic plastics flowing
Property higher and mould alignment magnetic field it is more high more be advantageous to improve the magnetic degree of orientation, reach the effect that saturation magnetizes.Therefore,
The magnetic property of injection molded magnets is improved, mainly there are three kinds of methods：First, improve the mobility of material；Second, reduce magnetic coercivity；
Third, improve mould alignment magnetic field.
Generally, injection molded magnets will pursue magnetic filling rate as high as possible to improve its magnetic property；And high magnetic filling
Rate inverts to magnetic, oriented tapes carry out certain difficulty, therefore, to play the performance of high filling injecting magnetic, it is necessary to improve as far as possible
Mold temperature, the viscosity of melt in a mold is reduced so as to improve the magnetic degree of orientation；At the same time, mold temperature significantly carries
Height, the coercivity of magnetic can be reduced, be also beneficial to magnetic orientation and magnetize；So, after waiting injection molded magnets to cool and solidify, highest is kept
The degree of orientation, while its coercivity can also go back up to initial level.
For being molded magnetic plastics, if the intrinsic mobility of raw material is too high, injection molded magnets intensity can be caused to decline, Wu Fabao
Demonstrate,prove normal use；And mould magnetize mode mainly have permanent magnet orientation and electromagnetic field orientation, especially permanent magnet be orientated, its be orientated
Magnetic field intensity is also certain, and especially under high temperature, alignment magnetic field can be reduced gradually, final to influence the effect that magnetizes.Therefore,
The magnetic property of injection molded magnets is improved, optimal state is when Lijection orientation, and mold temperature is brought up into material melts
Temperature, now melt viscosity is minimum, and magnetic coercivity can significantly decline, and is advantageous to reach and is fully oriented, and saturation magnetizes.Magnetize
After orientation terminates, the quick mold temperature that reduces makes melt keep maximum orientation effect after solidifying to room temperature level.
At present, mold temperature set is both referred to magnetic plastics matrix in the Shooting Technique of existing injection molded magnets in industry
Conventional mould temperature, and magnetic plastics cool down and is exceedingly fast because magnetic loading is high, in orientation melt viscosity than having moulded completely
The change time is much higher, and certain difficulty is caused to fully orientation.
Therefore, present invention the problem of being set for existing injection molded magnets with mold temperature, devising a set of can quickly add
Heat, cooling mould temperature, so as to improve the mould heating and cooling system that magnet is orientated the effect that magnetizes, it is particularly suitable for use in and is difficult to saturation orientation
The high magnetic filling rate system and the magnetic filling system of high-coercive force to magnetize.
The content of the invention
The object of the invention technical problem to be solved is to provide a kind of mold temperature for improving the injection molded magnets degree of orientation
Control system, applied to injecting magnetic mould, when magnet injection molding, magnetic is improved by quickly heating, cooling down mould
The degree of orientation of body.
In order to solve the above technical problems, the technical solution adopted by the present invention is：One kind improves injecting magnetic injection moulding orientation
Method, comprise the following steps：
A kind of method for improving the injection molded magnets degree of orientation, when the injection of magnetic plastics melt is filled with mold cavity, lead to
Cross and improve mold cavity temperature to improve the degree of orientation of the magnetic plastics melt；The magnetic plastics injection with mould include mould bases,
Mold cores, mold cavity, liftout attachment, temperature sensor, mold heating device, equipment for cooling die and magnet orientation field；
When magnet injection molding, before magnetic plastics melt is injected into mold cavity, mould nonstorage calorifier is opened, quickly
Mold temperature is increased to material melting temperature, then quick mold filling, completes orientation, magnetize；Fast mould is closed quickly to heat
Device, fast cooling device is opened, mould is cooled to room temperature in a short time, opened mould, ejecting product, obtain height and take
To injection molded magnets.
Further, a kind of method for improving the injection molded magnets degree of orientation, mould nonstorage calorifier selects heat conduction in the program
One or two kinds of in oil heating, eddy heating for heating, this method is easy to implement, easily controllable, and energy consumption is low, and environmental protection, heating effect are good；
Cooling Mode uses the pipeline for opening connection behind in die cavity, is passed through Rapid Circulation chilled water, and material and die strip are come
Heat discharge rapidly, solidify height-oriented magnetic plastics melt cooling, keep the higher degree of orientation.
Further, a kind of method for improving the injection molded magnets degree of orientation, due to such as iron oxygen of the magnetic contained by magnetic plastics
Body, samarium iron nitrogen, the coercivity of neodymium iron boron all have negative temperature coefficient for temperature, i.e., as temperature is raised under coercivity
Drop.So when relatively low alignment magnetic field can just make the magnetic material that these difficult saturations magnetize in injection, quickly
Mould is heated to the melting temperature of setting, magnetic coercivity is reduced, reduces melt viscosity, improve the degree of orientation；Melt mold filling, orientation
Mold temperature is quickly reduced after end to room temperature, makes melt cooling solidify to obtain height-oriented injection molded magnets, now, magnet
Coercivity goes back up to initial level again.
Compared with prior art, the present invention has following benefit：(1), realized beneficial to electromagnetic induction, eddy heating for heating to mould
The quick heating of tool, magnetic plastics melt mobility in a mold and filling mold speed, the coercivity for reducing magnetic are improved,
Be advantageous to improve the degree of orientation of magnetic in magnetic plastics；(2), the present invention using the means that quickly cool down by mold filling, be orientated, magnetize
Magnetic plastics melt afterwards is quickly cooled to room temperature, ensures that the nearest degree of orientation is not destroyed；(3) mould designed by the present invention
Gradient of temperature method is favorably improved the injection molded magnets orientation of filling rate and high-coercive force.
Embodiment：
Embodiment 1：From nylon 6- ferrimagnetisms plastics as raw material, the remanent magnetism Brp of magnetic used is 4200Gs, warp
Injection machine injection prepares magnet.It is 200 DEG C by mold temperature set, during injection moulding, nonstorage calorifier is opened, using vortex
Mould was heated to 200 DEG C by the mode of heating in 3 seconds, while injection filling mould, was orientated and is magnetized；Be then shut off quick heating by
Key, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample is cooled to room
Its magnetic property is tested after temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 2715Gs, and Vp is the volume fraction 65% shared by magnetic；Root
The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 99.1%.
Embodiment 2：From nylon 6- ferrimagnetisms plastics as raw material, the remanent magnetism Brp of magnetic used is 4200Gs, warp
Injection machine injection prepares magnet.It is 80 DEG C by mold temperature set, during injection moulding, nonstorage calorifier is opened, using heat conduction
Mould was heated to 80 DEG C by the mode of oil heating in 3 seconds, while injection filling mould, was orientated and is magnetized；It is then shut off quickly heating
Button, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample is cooled to
Its magnetic property is tested after room temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 2550Gs, and Vp is the volume fraction 65% shared by magnetic；
The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 93.4%.
Embodiment 3：From nylon 12- Neodymium iron boron magnetics plastics as raw material, the remanent magnetism Brp of magnetic used is 12000Gs,
Magnet is prepared through injection machine injection.It is 150 DEG C by mold temperature set, during injection moulding, nonstorage calorifier is opened, using whirlpool
Mould was heated to 150 DEG C by the mode for flowing heating in 3 seconds, while injection filling mould, was orientated and is magnetized；It is then shut off quickly heating
Button, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample is cooled to
Its magnetic property is tested after room temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 7250Gs, and Vp is the volume fraction 65% shared by magnetic；
The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 92.9%.
Embodiment 4：From nylon 12- Neodymium iron boron magnetics plastics as raw material, the remanent magnetism Brp of magnetic used is 12000Gs,
Magnet is prepared through injection machine injection.It is 80 DEG C by mold temperature set, during injection moulding, nonstorage calorifier is opened, using electricity
Mould was heated to 80 DEG C by the mode of heating in 3 seconds, while injection filling mould, was orientated and is magnetized；Be then shut off quick heating by
Key, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample is cooled to room
Its magnetic property is tested after temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 6100Gs, and Vp is the volume fraction 65% shared by magnetic；Root
The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 78.8%.
Embodiment 5：It is as raw material, the remanent magnetism Brp of magnetic used from polyphenylene sulfide-Neodymium iron boron magnetic plastics
12000Gs, magnet is prepared through injection machine injection.It is 280 DEG C by mold temperature set, during injection moulding, opens quick heating dress
Put, mould is heated to 280 DEG C in 5 seconds by the way of eddy heating for heating, while injection filling mould, be orientated and magnetize；Then close
Quick heating button is closed, rapid cooling water is opened, mould is cooled to room temperature in 50 seconds, mould is opened and takes out product.Treat
Sample tests its magnetic property after being cooled to room temperature, and the remanent magnetism Brb for measuring bonded permanent magnet is 7100Gs, and Vp is the volume shared by magnetic
Fraction 63%；The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 93.9%.
Embodiment 6：It is as raw material, the remanent magnetism Brp of magnetic used from polyphenylene sulfide-Neodymium iron boron magnetic plastics
12000Gs, magnet is prepared through injection machine injection.It is 80 DEG C by mold temperature set, during injection moulding, opens quick heating dress
Put, mould is heated to 80 DEG C in 3 seconds by the way of eddy heating for heating, while injection filling mould, be orientated and magnetize；It is then shut off
Quick heating button, opens rapid cooling water, mould is cooled into room temperature in 30 seconds, opens mould and takes out product.Treat sample
Product test its magnetic property after being cooled to room temperature, and the remanent magnetism Brb for measuring bonded permanent magnet is 5520Gs, and Vp is the volume integral shared by magnetic
Number 63%；The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 73%.
Embodiment 7：From nylon 12- shirts iron nitrogen magnetic plastics as raw material, the remanent magnetism Brp of magnetic used is 10000Gs,
Magnet is prepared through injection machine injection.It is 150 DEG C by mold temperature set, during injection moulding, nonstorage calorifier is opened, using electricity
Mould was heated to 150 DEG C by the mode of heating in 5 seconds, while injection filling mould, was orientated and is magnetized；Be then shut off quick heating by
Key, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample is cooled to room
Its magnetic property is tested after temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 6300Gs, and Vp is the volume fraction 65% shared by magnetic；Root
The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 96.9%.
Embodiment 8：From nylon 12- shirts iron nitrogen magnetic plastics as raw material, the remanent magnetism Brp of magnetic used is 10000Gs,
Magnet is prepared through injection machine injection.It is 60 DEG C by mold temperature set, during injection moulding, opens nonstorage calorifier, using leads
Mould was heated to 60 DEG C by the mode of deep fat heating in 3 seconds, while injection filling mould, was orientated and is magnetized；It is then shut off quick add
Hot button, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample cools down
Its magnetic property is tested after to room temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 5100Gs, and Vp is the volume fraction shared by magnetic
65%；The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 78.4%.
Embodiment 9：From polypropylene-ferrimagnetism plastics as raw material, the remanent magnetism Brp of magnetic used is 4200Gs,
Magnet is prepared through injection machine injection.It is 180 DEG C by mold temperature set, during injection moulding, nonstorage calorifier is opened, using whirlpool
Mould was heated to 180 DEG C by the mode for flowing heating in 3 seconds, while injection filling mould, was orientated and is magnetized；It is then shut off quickly heating
Button, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample is cooled to
Its magnetic property is tested after room temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 2510Gs, and Vp is the volume fraction 60% shared by magnetic；
The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 99.6%.
Embodiment 10：From polypropylene-ferrimagnetism plastics as raw material, the remanent magnetism Brp of magnetic used is 4200Gs,
Magnet is prepared through injection machine injection.It is 80 DEG C by mold temperature set, during injection moulding, opens nonstorage calorifier, using leads
Mould was heated to 80 DEG C by the mode of deep fat heating in 3 seconds, while injection filling mould, was orientated and is magnetized；It is then shut off quick add
Hot button, rapid cooling water is opened, mould is cooled to room temperature in 30 seconds, opened mould and take out product.Treat that sample cools down
Its magnetic property is tested after to room temperature, the remanent magnetism Brb for measuring bonded permanent magnet is 2350Gs, and Vp is the volume fraction shared by magnetic
60%；The degree of orientation that the magnet is calculated according to bonded permanent magnet degree of orientation formula DOA=Brb/Vp*Brp is 93.3%.
Figure of description explanation：
Fig. 1 is the schematic diagram of conduction oil and the injecting magnetic mould of cooling water control mould temperature；
Fig. 2 is the heat conduction oil circuit and waterway circulating schematic diagram of conduction oil and the injecting magnetic mould of cooling water control mould temperature；
Fig. 3 is the schematic diagram of the injecting magnetic mould of electrical heating and cooling water control mould temperature；
Fig. 4 is electrical bar arrangement and the waterway circulating schematic diagram of the injecting magnetic mould of electrical heating and cooling water control mould temperature.
Fig. 5 is the schematic diagram of eddy heating for heating and the injecting magnetic mould of cooling water control mould temperature；
Fig. 6 is the vortex and waterway circulating schematic diagram of eddy heating for heating and the injecting magnetic mould of cooling water control mould temperature.
Claims (5)
- A kind of 1. method for improving the injection molded magnets degree of orientation, it is characterised in that the injection molding that the mould is applied to injecting magnetic adds Work, including injection mould base, mould, equipment for cooling die, mold heating device and magnetic field orientating field, wherein quick heating is used and led Deep fat heating, eddy heating for heating, Cooling Mode use Rapid Circulation chilled water, such as Figure of description；The mould has quick Heating and the function that quickly cools down, applied to preparing injecting magnetic product, when magnetic plastics melt is injected into mold cavity, Mould nonstorage calorifier is opened, mold temperature is quickly increased to material melting temperature, then quick mold filling, completion orientation, Magnetize；Fast mould nonstorage calorifier is shut, fast cooling device is opened, mould is cooled to room temperature in a short time, beaten Mold, take out sample；Obtain height-oriented injection molded magnets.
- A kind of 2. method of design and the heating cooling of injecting magnetic injection moulding orientation mould：It is characterized in that the injection quickly adds One or both of hot mode heat-conducting oil heating, electrical heating and eddy heating for heating mode, work as injection start time, and heater is beaten Open, mould is heated to design temperature in 2 ~ 5 seconds.
- A kind of 3. method of design and the heating cooling of injecting magnetic injection moulding orientation mould：It is characterized in that the fast quickly cooling of the injection But method is to be passed through Rapid Circulation chilled water by pipeline, when injection is complete between, heater is closed, while cooling device is beaten Open, mould is cooled to design temperature in 10 ~ 100 seconds.
- A kind of 4. method of design and the heating cooling of injecting magnetic injection moulding orientation mould：It is characterized in that injection heating is cold But method is applied to the injecting magnetic raw material of nylon 6, nylon 12, polypropylene and polyphenylene sulfide matrix；Its mould quickly heats Temperature design is set as room temperature in material melting temperature, chilling temperature.
- A kind of 5. method of design and the heating cooling of injecting magnetic injection moulding orientation mould：It is characterized in that set in corresponding material The coercivity of magnetic can drastically decline as temperature raises in injecting magnetic melt under constant temperature degree so that magnet easily reaches saturation Orientation；After mold filling terminates, quickly cooling device is opened, mould is cooled fast to room temperature, melt solidification, now, magnet is rectified Stupid power reduces with temperature and goes back up to initial level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610707646.2A CN107756749A (en) | 2016-08-22 | 2016-08-22 | A kind of method for improving the injection molded magnets degree of orientation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610707646.2A CN107756749A (en) | 2016-08-22 | 2016-08-22 | A kind of method for improving the injection molded magnets degree of orientation |
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| CN107756749A true CN107756749A (en) | 2018-03-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110931236A (en) * | 2019-11-20 | 2020-03-27 | 杭州科德磁业有限公司 | Injection molding anisotropic bonding neodymium iron boron magnetic tile radiation orientation forming method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079344A (en) * | 2006-05-23 | 2007-11-28 | 漯河三友电子科技有限公司 | A temperature-voltage high Hcj anisotropic Nd-Fe-Br felt magnet and its making method |
| CN201287451Y (en) * | 2008-07-16 | 2009-08-12 | 陆延强 | Magnetic effect heating apparatus for injection mold without trace |
| CN204160687U (en) * | 2014-09-05 | 2015-02-18 | 杭州普门磁性器件有限公司 | NdFeB material Lijection orientation machine |
-
2016
- 2016-08-22 CN CN201610707646.2A patent/CN107756749A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079344A (en) * | 2006-05-23 | 2007-11-28 | 漯河三友电子科技有限公司 | A temperature-voltage high Hcj anisotropic Nd-Fe-Br felt magnet and its making method |
| CN201287451Y (en) * | 2008-07-16 | 2009-08-12 | 陆延强 | Magnetic effect heating apparatus for injection mold without trace |
| CN204160687U (en) * | 2014-09-05 | 2015-02-18 | 杭州普门磁性器件有限公司 | NdFeB material Lijection orientation machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110931236A (en) * | 2019-11-20 | 2020-03-27 | 杭州科德磁业有限公司 | Injection molding anisotropic bonding neodymium iron boron magnetic tile radiation orientation forming method and device |
| CN110931236B (en) * | 2019-11-20 | 2021-07-13 | 杭州科德磁业有限公司 | Injection molding anisotropic bonding neodymium iron boron magnetic tile radiation orientation forming method and device |
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Application publication date: 20180306 |