CN107127337A - A kind of two-part degreasing method of powder injection molding shaping - Google Patents
A kind of two-part degreasing method of powder injection molding shaping Download PDFInfo
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- CN107127337A CN107127337A CN201710486232.6A CN201710486232A CN107127337A CN 107127337 A CN107127337 A CN 107127337A CN 201710486232 A CN201710486232 A CN 201710486232A CN 107127337 A CN107127337 A CN 107127337A
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- degreasing
- temperature
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- injection molding
- idiosome
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- 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
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
- B22F3/1025—Removal of binder or filler not by heating only
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention provides a kind of two-part degreasing method of powder injection molding shaping.The two-part degreasing method of the present invention includes low-temperature defatted section and High-Temperature Strengthening section, and low-temperature defatted section of temperature is 40~145 DEG C, and the temperature of High-Temperature Strengthening section is 150~200 DEG C；Leading portion is low-temperature defatted can to increase degreasing efficiency, reduce the slight crack caused by moulding stress；Back segment High-Temperature Strengthening section can increase idiosome intensity and increase sintered density after degreasing, and in favor of being recessed caused by bumper injury in transportation, to lack material and scratch etc. bad.A kind of two-part degreasing method of powder injection molding shaping of the present invention is applied in powder injection molding process, is conducive to extending the storage time of degreasing embryo, is easy to long-distance transport；The two-part degreasing method of the present invention is conducive to the high parts of the complicated, excellent performance of production, required precision, adds the application surface of powder injection molding shaping.
Description
Technical field
The invention belongs to powder injection molding molding manufacture procedure technical field, and in particular to a kind of two-part of powder injection molding shaping takes off
Fat method.
Background technology
In recent years, powder injection molding moulding process in 3C Product such as the field such as mobile phone and Wearable product by terminal client
It is a large amount of to use.Powder injection molding moulding process includes four-stage：Mixing, shaping, degreasing and sintering, wherein, degreasing is powder note
Mould most complicated, most important link in moulding process.Current topmost degreasing mode has thermal debinding, solvent degreasing and catalysis de-
Fat, often produces many defects in skimming processes, and the defect that the degreasing stage produces can not be eliminated in sintering stage, be catalyzed
Degreasing has the advantages that degreasing defect is few, debinding rate is fast, therefore, and catalysis degreasing turns into main degreasing mode at home.
CN102554234A discloses the processing method and its support jig of a kind of metal injection molded contoured members, and its heat is de-
Fat process；Degreasing time is 20 hours~30 hours, and temperature is 200 DEG C~500 DEG C, and points 3 to 4 grades improve temperature step by step, from into
The bonding agent of abjection 30%~50% in parison part, under the high temperature conditions, the volatilization of bonding agent part make moulded blank formation part
Through hole shape, obtains degreasing blank, and the skimming temp of the invention is high, and degreasing reaction is too fast, and generation air pressure is excessive in base substrate, easily goes out
Existing degreasing defect, and temperature Tai Gaoyi make blank deformation and macromolecule remove completely after idiosome without intensity.
The catalysis degreasing program typically degreasing condition that is provided according to BASF carries out degreasing, and it advises that highest skimming temp is
145 DEG C, debinding rate is 1mm/h × product thickness, and the de- degreasing rate of acid be distributed in 7.0 according to the particle diameters of different powders, external form~
10.2%, so when shaping idiosome is after catalysis degreasing processing procedure, general 80~95% POM has been removed, and is only left 5~20%
High polymer material it is scattered be distributed in powder surface, therefore cause degreasing idiosome intensity to die-off, be unfavorable for short distance or long range
Transport process, therefore how to solve current disadvantages and be necessary.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of two-part degreasing side of powder injection molding shaping
Method, the intensity of obtained degreasing embryo is high, is readily transported, while the problem of can improving high temperature sintering deformation of products, can increase production
Product density.
For up to this purpose, the present invention uses following technical scheme：
A kind of two-part degreasing method of powder injection molding shaping, the two-part degreasing method includes low-temperature defatted section and high
Medium-temperature reinforced section, described low-temperature defatted section of temperature is 40~145 DEG C, and the temperature of the High-Temperature Strengthening section is 150~200 DEG C.Its
In, low-temperature defatted section of temperature is divided into low-temperature defatted section of skimming temp of solvent degreasing and catalysis degreasing again：Solvent degreasing
Low-temperature defatted section of skimming temp is 40~100 DEG C, and low-temperature defatted section of skimming temp of catalysis degreasing is 85~145 DEG C.
Leading portion is low-temperature defatted can to increase degreasing efficiency, reduce the part slight crack caused by moulding stress；Back segment high temperature
Strengthening segment can increase idiosome intensity after degreasing, in favor of being recessed caused by bumper injury in transportation, lack material and scratch etc.
It is bad, shorten the distance between powder, increase the consistency of sintering, while improving part sintering warpage, increase product density.
Degreasing is to exclude the organic matter in formed body by heating and other physical methods and produce the mistake sintered on a small quantity
Journey.Degreasing mode can be divided into the low-temperature defatted and institute in catalysis degreasing and solvent degreasing, two-part degreasing method of the present invention
The degreasing for stating High-Temperature Strengthening section is applied to catalysis degreasing or solvent degreasing, i.e., two-part degreasing method of the invention is suitable for cerul
The catalysis degreasing mode of the solvent degreasing mode of system and modeling based system, the High-Temperature Strengthening section action principle of two degreasing modes is
The same, although make the difference of material composition and amount according to macromolecule inside feeding, the intensity of obtained degreasing idiosome has difference
It is different, but the overall intensity still than traditional dispersing mode is well a lot.
The principle of catalysis degreasing is that organic carrier molecules are decomposed into less volatilizable molecule using a kind of catalyst,
Organic carrier molecules in other skimming processes of these molecular proportions have higher vapour pressure, can promptly diffuse out base substrate.Catalysis
The binder system that degreasing process is used is usually to be made up of the additive of aldehyde resin and a stabilization.Polyacetals matrix system
Because the high compatibility between powder of polarity is good, molding blank intensity is high.Under the catalytic action of acid vapor, the solution of polyacetals class
Poly- reaction is typically quickly carried out between 110~150 DEG C, and reaction product is gaseous formaldehyde monomer.This reaction temperature is less than poly- first
The fusing point of urea formaldehyde, to prevent liquid phase from generating.So avoid to cause green compact soft due to generation liquid phase during thermal debinding
Change, or the deformation produced and defect due to the influence of gravity, internal stress or VISCOUS FLOW.Gaseous acid is not through binding agent, reaction
Simply carried out on the interface of gas and binding agent.The diffusion of gas is limited on established porous shell, inside green compact
Pressure will not be formed.Catalysis degreasing technique of the present invention, main binder, polypropylene, poly- second are used as using polyformaldehyde (POM)
Alkene etc. is as auxiliary material, and quick catalysis is decomposed into formaldehyde in acid atmosphere, and acid atmosphere can be nitric acid, oxalic acid gas,
The effect of fast eliminating binding agent can be reached, liquid phase will not be produced in whole skimming processes, so as to avoid deformation, cave in
The generation of degreasing defect.
Solvent degreasing is that solvent molecule diffuses into parison first, and then binding agent is dissolved in be formed in solvent and bonded
Agent-solvent solution, bonds agent molecule into preform surface is diffused into by binding agent-solvent solution in parison, is diffused into
The bonding agent molecule of preform surface is detached into parison and entered in solvent solution.The characteristics of solvent degreasing is efficiency high, degreasing time
It is short, simultaneously as wherein polymer is not dissolved, can still it keep base substrate indeformable during degreasing.Degreasing process of the present invention, is adopted
With paraffin series (WAX) as main binder, the material such as polyformaldehyde, polypropylene, polyethylene is auxiliary material, with acetone, petrochemical industry agent,
Chloroform etc. is solvent, is also increased as the increase paraffin of temperature is dissolved in acetone, petrochemical industry agent, the amount in chloroform equal solvent and speed
Plus.
In the present invention, low-temperature defatted section of skimming temp of the solvent degreasing in solvent degreasing processing procedure for 40~
100 DEG C, for example skimming temp be 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, 80 DEG C, 90 DEG C, 100 DEG C, degreasing time according to product thickness with
0.2~0.7mm/h × product thickness is calculated, and such as degreasing time is that 0.2mm/h × product thickness, 0.3mm/h × product are thick
Degree, 0.4mm/h × product thickness, 0.5mm/h × product thickness, 0.6mm/h × product thickness, 0.7mm/h × product thickness.
The low-temperature defatted macromolecule that can reduce in catalysis degreasing processing procedure is given birth to caused by rising-heat contracting-cold effect and moulding stress
The slight crack of embryo product is produced, and causes the cracking of product after sintering.Low-temperature defatted section of skimming temp of the catalysis degreasing is 85
~145 DEG C, for example skimming temp be 85 DEG C, 90 DEG C, 95 DEG C, 100 DEG C, 105 DEG C, 110 DEG C, 115 DEG C, 120 DEG C, 125 DEG C, 130
DEG C, 135 DEG C, 140 DEG C, 145 DEG C, degreasing time is calculated according to product thickness with 0.7~1.5mm/h × product thickness, for example take off
The fat time is 0.7mm/h × product thickness, 0.8mm/h × product thickness, 0.9mm/h × product thickness, 1mm/h × product thickness
Degree, 1.1mm/h × product thickness, 1.2mm/h × product thickness, 1.3mm/h × product thickness, 1.4mm/h × product thickness,
1.5mm/h × product thickness.
The reinforcing temperature of High-Temperature Strengthening section is 150~200 DEG C, for example strengthen temperature be 150 DEG C, 160 DEG C, 170 DEG C,
180 DEG C, 190 DEG C, 200 DEG C, enhanced time be 60~120min, for example enhanced time be 60min, 70min, 80min, 90min,
100min、110min、120min.Preferably, the skimming temp of High-Temperature Strengthening section is 160~170 DEG C, such as 160 DEG C,
161 DEG C, 162 DEG C, 163 DEG C, 164 DEG C, 165 DEG C, 166 DEG C, 167 DEG C, 168 DEG C, 139 DEG C, 170 DEG C, enhanced time is 90min.
High-Temperature Strengthening of the present invention section is simultaneously suitable for solvent degreasing and catalysis degreasing the two different degreasing systems.
The powder includes metal dust and ceramic powders.
A kind of two-part degreasing method of powder injection molding shaping of the present invention, powder is introduced by this two-part degreasing method
Injection molding process, with reference to low-temperature defatted excellent efficiency and High-Temperature Strengthening effect, can obtain the degreasing embryo of excellent performance
Body (brown embryo).
Preferably, the two-part degreasing method of powder injection molding of the invention shaping, comprises the following steps：By powder
Cerul feeding is kneaded into binding agent, after blank is made through injection molding, blank is soaked in 20 in 40~100 DEG C of solvent~
24 hours, degreasing idiosome is obtained after cooling air-drying, then degreasing idiosome is placed in baking oven is heated to 150~200 DEG C of insulations
The degreasing idiosome strengthened after 60~120min, cooling.
As another preferred scheme, the two-part degreasing method that powder injection molding of the invention is molded comprises the following steps：
Powder and binding agent are kneaded into modeling base feeding, blank is made through injection molding, acid filling system is opened by blank in 85~145 DEG C
At a temperature of catalysis degreasing, degreasing time calculates according to product thickness with 0.7~1.5mm/h × product thickness, closes acid filling system
Afterwards, 150~200 DEG C of 60~120min of insulation, the degreasing idiosome strengthened after cooling are warming up to.
Another object of the present invention also resides in provide that a kind of two-part degreasing method as described above prepares de-
Fat idiosome, its intensity is high, product density is big, is readily transported.
Compared with prior art, beneficial effects of the present invention are：
(1) of the invention low-temperature defatted section, low-temperature sintering can reduce brown caused by rising-heat contracting-cold and moulding stress
Sintered products cracking caused by embryo cracking, improves degreasing efficiency.
(2) High-Temperature Strengthening of the invention section, effectively can be distributed on powder surface by remaining macromolecule and be formed with intensity
Idiosome, idiosome can withstand greater than the loading of more than 2.5 times of traditional approach, play a protective role simultaneously, it is to avoid powder with it is empty
Gas reclaimed water molecule contacts, and because the capillary force of polymeric fluid shortens distance between powder and powder, maximum can shorten away from
From for 0.06mm, be conducive to the lifting of follow-up sintering density.
(3) the two-part degreasing method that a kind of powder injection molding is molded by the present invention is applied in powder injection molding process,
Be conducive to extending the storage time of degreasing embryo, be easy to long-distance transport.
Brief description of the drawings
The catalysis degreasing program schematic diagram for the two-part degreasing method that Fig. 1 is molded for the powder injection molding of the present invention.
The principle schematic for the two-part degreasing method high temperature strengthening segment that Fig. 2 is molded for the powder injection molding of the present invention.
Embodiment
Technical scheme is further illustrated with reference to Fig. 1, Fig. 2 and by embodiment.
Fig. 1 is catalysis degreasing program schematic diagram of the invention.It is divided into two sections in figure：Low-temperature defatted section and High-Temperature Strengthening section.
Wherein, 85~145 DEG C of low-temperature defatted temperature range, about 85 DEG C of the vapourizing temperature of nitric acid, with the increase of skimming temp, cavity
The elongated concentration reduction of interior gas molecular link but activity increase, it is low-temperature defatted to make concentration of nitric acid highest, degreasing efficiency highest,
Simultaneously because the high molecular thermal expansion stress of low temperature is relatively low, cumulative effects will not be formed with moulding stress and degreasing idiosome slight crack is caused
Produce or ftracture, but consider that nitric acid liquid has corrosion problems, for safety, skimming temp preferably is at 90~115 DEG C；
Its degreasing time is variant according to product size, typically using 0.5~1.5mm/h × product thickness as scope, degreasing time preferably
For 0.7~0.8mm/h × product thickness.And the reinforcing temperature design of High-Temperature Strengthening section is mainly come according to conventional macromolecule fusing point
Consider, most macromolecule can be melt into liquid at 150~200 DEG C, and enhanced time is calculated with 60~120min, preferably
It is 160~170 DEG C to strengthen temperature, and further preferred enhanced time is 90min.
Fig. 2 is the principle schematic of the two-part degreasing method high temperature strengthening segment of the present invention.In figure, macromolecule
In in addition to 80~95% POM main bodys, also 5~20% macromolecule is evenly distributed on powder surface.When main body POM is removed
Afterwards, these remaining macromolecules are distributed in powder surface into irregular and island shape, it is impossible to provide idiosome intensity, and this is also to pass
Low intensive main cause is presented in obtained general idiosome idiosome after degreasing processing procedure in system method, therefore long-distance carrying is even
Short distance is carried and can not all realized, is caused the depression of the product caused by the bumper injury of brown embryo and scratch or even is caused internal stress.Therefore,
Temperature is improved to more than the fusing point of high polymer material used i.e. 150~200 DEG C by final stage, these isolated macromolecule meltings
The capillary force between powder acts on and is coated on powder surface afterwards, while the distance furthered between powder and powder, forms one and connect
The macromolecule membrane of continuous property, this continuous film has some strength after being formed, and protection powder surface is avoided and moisture in air
Sub- haptoreaction formation oxide layer.
Embodiment one
Base feeding is moulded using the 316L of mold power (OSF) 1.165, traditional single hop degreasing and two-part is respectively compared
Degreasing data.After traditional approach was with 145 DEG C of degreasings four hours, 25 DEG C are directly cooled to after closing acid filling system.And two-part is de-
Fat mode is low-temperature defatted four hours with 115 DEG C, closes after acid filling system, and 160 DEG C are directly warming up to again and holds temperature 90 minutes.Compare two
Planting product performance has following data：The idiosome of two-period form can withstand greater than the loading of 3 times of traditional approach, and its size has micro
Reduce 0.02~0.05mm, represent powder between distance have shortening and storehouse it is finer and close.With the raising of high-temperature region temperature, embryo
The macromolecule remolten of remaining higher melt in body so that covering property more preferably and cladding the strength of materials it is bigger, so its
The increase of idiosome intensity.Shown by the data and experimental result of the present embodiment, two-part degreasing mode is really than traditional single hop degreasing
Be conducive to production.
Embodiment two
Using the 316L cerul feedings of mold power (OSF) 1.185, traditional single hop degreasing and two-part are respectively compared
Degreasing data.Sample is immersed in 30~60 DEG C of solvent after 20~24 hours by traditional approach, air-dry after degreasing embryo.And
Two-part degreasing mode is to increase by one High-Temperature Strengthening section under traditional approach temperature is risen into 170 DEG C to hold temperature 120 minutes with auxiliary
Helping macromolecule to be coated on powder surface after melting increases its intensity.The idiosome of two-period form can withstand greater than 2.5 times of traditional approach
Loading, and its size has 0.03~0.06mm of micro diminution, represents that the distance between powder has the finer and close of shortening and storehouse.With
The macromolecule remolten of remaining higher melt in the raising of high-temperature region temperature, idiosome so that covering property is more preferable and coats
The strength of materials it is bigger, so its idiosome intensity increase.Equally, shown by the data and experimental result of the present embodiment, two-part
Degreasing mode is more beneficial for production than traditional single hop degreasing.
The two-part degreasing method of the powder injection molding shaping of the present invention, passes through low-temperature defatted section and High-Temperature Strengthening section two-part
Degreasing, powder injection molding moulding process is introduced by this two-part degreasing method, with reference to low-temperature defatted excellent efficiency and high temperature
Strengthen effect, the degreasing idiosome of excellent performance can be obtained, be conducive to the complicated, excellent performance of production, required precision high
Parts, add the application surface of powder injection molding shaping.
Applicant states that the present invention illustrates detailed process equipment and the technological process of the present invention by above-described embodiment,
But the invention is not limited in above-mentioned detailed process equipment and technological process, that is, do not mean that the present invention has to rely on above-mentioned detailed
Process equipment and technological process could be implemented.Person of ordinary skill in the field it will be clearly understood that any improvement in the present invention,
Addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all fall within the present invention's
Within the scope of protection domain and disclosure.
Claims (10)
1. a kind of two-part degreasing method of powder injection molding shaping, it is characterised in that the two-part degreasing method includes low temperature
Degreasing section and High-Temperature Strengthening section, described low-temperature defatted section of temperature is 40~145 DEG C, and the temperature of the High-Temperature Strengthening section is 150
~200 DEG C.
2. two-part degreasing method according to claim 1, it is characterised in that described low-temperature defatted and described High-Temperature Strengthening
The degreasing of section is catalysis degreasing or solvent degreasing.
3. two-part degreasing method according to claim 2, it is characterised in that low-temperature defatted section of the solvent degreasing
Skimming temp is 40~100 DEG C, and degreasing time is calculated according to product thickness with 0.2~0.7mm/h × product thickness.
4. two-part degreasing method according to claim 2, it is characterised in that low-temperature defatted section of the catalysis degreasing
Skimming temp is 85~145 DEG C, and degreasing time is calculated according to product thickness with 0.7~1.5mm/h × product thickness.
5. the two-part degreasing method according to one of claim 1-4, it is characterised in that the degreasing of the High-Temperature Strengthening section
Temperature is 150~200 DEG C, and enhanced time is 60~120min.
6. the two-part degreasing method according to one of claim 1-5, it is characterised in that the degreasing of the High-Temperature Strengthening section
Temperature is 160~170 DEG C, and enhanced time is 90min.
7. the two-part degreasing method according to one of claim 1-6, it is characterised in that the powder includes metal dust
And ceramic powders.
8. the two-part degreasing method according to one of claim 1-7, it is characterised in that comprise the following steps：By powder
Cerul feeding is kneaded into binding agent, after blank is made through injection molding, blank is soaked in 20 in 40~100 DEG C of solvent~
24 hours, degreasing idiosome is obtained after cooling air-drying, then degreasing idiosome is placed in baking oven is heated to 150~200 DEG C of insulations
The degreasing idiosome strengthened after 60~120min, cooling.
9. the two-part degreasing method according to one of claim 1-7, it is characterised in that comprise the following steps：By powder
Modeling base feeding is kneaded into binding agent, blank is made through injection molding, unlatching acid filling system is by blank at a temperature of 85~145 DEG C
Catalysis degreasing, degreasing time is calculated according to product thickness with 0.7~1.5mm/h × product thickness, is closed after acid filling system, heating
To 150~200 DEG C of 60~120min of insulation, the degreasing idiosome strengthened after cooling.
10. the degreasing idiosome that a kind of two-part degreasing method using as described in one of claim 1-7 is prepared.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108296479A (en) * | 2018-03-05 | 2018-07-20 | 曲靖中铭科技有限公司 | A kind of segmented high temperature degreasing method that can effectively improve degreasing part intensity |
| CN112170845A (en) * | 2020-09-28 | 2021-01-05 | 西部宝德科技股份有限公司 | Degreasing method for powder porous metal film |
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| CN112170845B (en) * | 2020-09-28 | 2022-09-20 | 西部宝德科技股份有限公司 | Degreasing method for powder porous metal film |
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Application publication date: 20170905 |