CN110142401A - Precoated metal/ceramics/molding sand powder preparation method - Google Patents
Precoated metal/ceramics/molding sand powder preparation method Download PDFInfo
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- CN110142401A CN110142401A CN201910446423.9A CN201910446423A CN110142401A CN 110142401 A CN110142401 A CN 110142401A CN 201910446423 A CN201910446423 A CN 201910446423A CN 110142401 A CN110142401 A CN 110142401A
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- powder
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/34—Process control of powder characteristics, e.g. density, oxidation or flowability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/06—Jet mills
- B02C19/061—Jet mills of the cylindrical type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- 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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/044—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by jet milling
-
- 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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/045—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by other means than ball or jet milling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The present invention provides a kind of preparation methods of precoated metal/ceramics/molding sand powder, comprising: metal/ceramic/molding sand powder and binder S1, are carried out mixing granulator processing, obtain being kneaded particle；S2, mixing particle is subjected to broken pulverization process, obtains precoated metal/ceramics/molding sand powder.The beneficial effects of the present invention are: provide a kind of precoated metal/ceramics/molding sand powder preparation method that can be obtained without adding mixed solvent, this method technical maturity is stablized, smashed precoated metal/ceramics/molding sand powder package effect is good, it is especially suitable for batch production, precoated metal/ceramics/molding sand powder obtained is suitable for SLS selective laser sintering and indirect metal/ceramic/molding sand 3D printing part is made.
Description
Technical field
The present invention relates to 3D printing material increases material manufacturing technology fields, refer in particular to a kind of precoated metal/ceramics/molding sand powder
The preparation method at end.
Background technique
Precoated metal/ceramics of existing SLS selective laser sintering/molding sand powder process is complicated, usually mainly has
Solvent precipitation prepares hot melt adhesive with the method for dilution dilution agent stirring, and wherein solvent precipitation needs to add mixing molten
Agent is prepared into binder cladding metal/ceramic/molding sand powder suspension, through being evaporated under reduced pressure, after separation of solid and liquid, and solid state powder
Vacuum drying, ball milling sieves to obtain precoated metal/ceramics/molding sand powder, and suspension preparation process is especially complicated, therefore, uses
In precoated metal/ceramics/molding sand powder production inefficiency of SLS selective laser sintering.
Therefore it needs to reform the prior art, improves precoated metal/ceramics/molding sand powder production efficiency.
Summary of the invention
The technical problems to be solved by the present invention are: it is simple, reliable to provide a kind of process, the overlay film suitable for batch production
Metal/ceramic/molding sand powder preparation method.
In order to solve the above-mentioned technical problem, a kind of the technical solution adopted by the present invention are as follows: precoated metal/ceramics/molding sand powder
The preparation method at end, comprising:
S1, metal/ceramic/molding sand powder and binder are subjected to mixing granulator processing, obtain being kneaded particle；
S2, mixing particle is subjected to broken pulverization process, obtains precoated metal/ceramics/molding sand powder.
Further, among step S1, using PIM (powder injection molding molding) dedicated kneading machine/pelletizer to required
The metal/ceramic of overlay film/molding sand powder carries out mixing granulator processing, and the kneading machine/pelletizer is that double crank shaft strength is kneaded
One of machine and mating pelletizer or combined type mixing granulator all-in-one machine.
Among step S2, it is crushed using one of crusher, ball mill or airslide disintegrating mill to particle is kneaded
Pulverization process.
Further, it is being carried out in the step of being crushed pulverization process using airslide disintegrating mill to particle is kneaded, comprising:
S21, the broken pulverization process of jet is carried out to mixing particle, obtain corase grinding powder；
S22, first time screening or air current classifying processing are carried out to corase grinding powder, obtain powder to be ground；
S23, jet fine grinding processing is carried out to corase grinding powder, obtains fine grinding powder；
S24, second of screening or air current classifying processing are carried out to fine grinding powder, obtain precoated metal/pottery of required size
Porcelain/molding sand powder.
Further, among step S1, the size for being kneaded particle is 1-4mm.
Further, it among step S21, is carried out at the broken crushing of jet with the air pressure of 0.3-1.2MPa to particle is kneaded
Reason.
Further, among step S23, jet fine grinding processing is carried out to particle is kneaded with the air pressure of 0.2-0.8MPa.
Further, among step S24, the precoated metal/ceramics/molding sand powder diameter screened out is 20-75um.
Further, among step S23, the processing time that jet fine grinding processing is carried out to corase grinding powder is 5-20min.
The beneficial effects of the present invention are: provide a kind of precoated metal/pottery that can be obtained without adding mixed solvent
Porcelain/molding sand powder preparation method, this method technical maturity are stablized, and smashed precoated metal/ceramics/molding sand powder wraps up effect
It is good, it is especially suitable for batch production, precoated metal/ceramics/molding sand powder obtained is suitable between SLS selective laser sintering is made
Connect metal/ceramic/molding sand 3D printing part.
Detailed description of the invention
Detailed process of the invention is described in detail with reference to the accompanying drawing:
Fig. 1 is precoated metal/ceramics/molding sand powder preparation flow schematic diagram of the invention；
Fig. 2 is broken pulverization process flow diagram of the invention.
Specific embodiment
In order to describe the technical content, the structural feature, the achieved object and the effect of this invention in detail, below in conjunction with embodiment
And attached drawing is cooperated to be explained in detail.
Referring to Fig. 1, a kind of preparation method of precoated metal/ceramics/molding sand powder, comprising:
S1, metal/ceramic/molding sand powder and binder are being subjected to mixing granulator processing, are obtaining being kneaded particle, this step
In, it is carried out using metal/ceramic/molding sand powder of PIM (powder injection molding molding) dedicated kneading machine/pelletizer to required overlay film
Mixing granulator processing, the kneading machine/pelletizer include being not limited to double crank shaft strength kneading machine and mating pelletizer, or answer
Box-like mixing granulator all-in-one machine, wherein be the binder of adaptation different formulations, the temperature of mixing is also different；
S2, mixing particle is subjected to broken pulverization process, obtains precoated metal/ceramics/molding sand powder.
In step sl, the present embodiment is that mixer is first preheating to 180-185 using the parameter of modeling based binder formula
DEG C, when temperature reaches preset temperature, pour powder to be processed into mixer, and powder to be processed is heated up to 180-185 DEG C,
Wherein, powder to be processed can be metal powder, ceramic powders or molding sand powder, after waiting mixers internal temperature to stablize, be added
Binder powder, when bonding agent is in molten state, the mixture for treating processing powder and bonding agent carries out mixing process, close
It is sufficiently stirred, sheared in banburying chamber's cavity of mill, continued 30-90 minutes, make the mixing of powder and bonding agent to be processed
Object is uniformly dispersed, and finally obtains the bulk hot material of the arogel one state of the complete cladding powder of binder, then will be kneaded completion
Bulk hot material puts into the hopper of pelletizer, and feed opening of granulating machine is in double wrist cutting modes, bulk hot material can be forced under feeding
Material mouth, bulk hot material gradually cooling molding in extrusion process, is squeezed out to die head by the single-screw compulsory below feed opening and is cut
Grain, to obtain partial size in the mixing particle of 1-4mm.
In step s 2, broken powder is carried out to particle is kneaded using one of crusher, ball mill or airslide disintegrating mill
Broken processing obtains precoated metal/ceramics/molding sand powder.
Crusher can will be kneaded Particle Breakage to the powder of 140 mesh (partial size 0.106mm), later with the reduction of partial size,
Efficiency also can be lower and lower, for example when to 200-325 mesh (partial size is in 0.075-0.045mm, i.e., 75-45 μm), can only get
The powder of 30-40%, therefore, the technique of crusher are more suitable for the biggish overlay film molding sand of partial size, in addition, crusher is equipped with cooling mould
Block can allow crushing effect more preferably.
Ball milling crusher machine needs to be added due to the phenomenon that ball milling can constantly generate heat, and dry ball milling will appear reunion
The lubricant (stearic acid) of 0.2-0.5%；Wet-milling then needs to be added the dispersing agent of a certain proportion of heptane and polarized, effect
Can be better, grinding, which finishes dry sieve of needs, can just obtain overlay film powder, higher cost, and technique is relative complex cumbersome.
Jet comminuting method is optimal breaking method.It is particularly suitable for preparing the small coating film metal powder of partial size and overlay film pottery
Porcelain powder.Referring to Fig. 2, specific step includes:
S21, the mixing particle that partial size is 1-4mm is put into jet pulverizer progress jet pulverization process, the powder of pulverizer
Broken chamber is cylindrical, and high pressure gas is sprayed into from the cavity wall of crushing chamber, and half can also be deviateed along radial direction by spraying into direction
Diameter direction, gas drive powder, hit it mutually or powder is made to hit cavity wall, broken fine powder will be by crushing chamber centre
Side outlet is taken out of with gas, and coarse powder then remains in cavity and continues to crush, and finally obtains corase grinding powder；
S22, first time screening process is carried out to corase grinding powder by air current classifying or vibrosieve, obtains powder to be ground
End；
S23, powder to be ground is put into jet pulverizer, reduces the air pressure of high pressure gas, carry out jet fine grinding processing, it can
To obtain the powder of shape almost spherical, such overlay film powder flowbility is good, and powdering effect is good for the corner angle blunt of powder；
S24, since too small powder (less than 20 μm) may contain only binder, need to pick out, it is therefore desirable to pass through gas
Flow point grade or vibrosieve carry out second of screening process to fine grinding powder, thus obtain precoated metal that partial size is 20-75um/
Ceramic powders.
As can be seen from the above description, the beneficial effects of the present invention are: providing one kind can obtain without adding mixed solvent
Precoated metal/ceramics/molding sand the powder preparation method obtained, this method technical maturity are stablized, and smashed precoated metal/ceramics/
Molding sand powder package effect is good, is especially suitable for batch production, and precoated metal/ceramics/molding sand powder obtained is selected suitable for SLS
Property is laser sintered to be made indirect metal/ceramic/molding sand 3D printing part.
Embodiment 1
Among step S21, jet pulverization process is carried out to particle is kneaded with the air pressure of 0.3-1.2MPa.
In the present embodiment, jet is carried out using the air pressure of 0.3-1.2MPa, air-flow can effectively drive mixing particle mutual
Particles hit cavity wall is hit or makes, so that broken become to roughly grind powder.
Embodiment 2
Among step S3, among step S23, carried out at jet fine grinding with the air pressure of 0.2-0.8MPa to particle is kneaded
Reason.
In the present embodiment, jet is carried out using the relatively low pressure of 0.2-0.8MPa, corase grinding powder can be allowed to stop in crushing chamber
It stays the time to extend, by the corner angle blunt of powder, obtains the powder of shape almost spherical, such overlay film powder flowbility is good, paving
Powder effect is good.
When powder is polished to a certain extent, quality lightens, then is exported by crushing chamber middle upper part as gas is taken out of this
A little powder collect to arrive fine grinding powder.
Embodiment 3
The processing time that jet fine grinding processing is carried out to corase grinding powder is 5-20min.
In the present embodiment, the polishing duration of 5-20min, it is ensured that the grinding effect of powder.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of preparation method of precoated metal/ceramics/molding sand powder, comprising:
S1, metal/ceramic/molding sand powder and binder are subjected to mixing granulator processing, obtain being kneaded particle；
S2, mixing particle is subjected to broken pulverization process, obtains precoated metal/ceramics/molding sand powder.
2. the preparation method of precoated metal/ceramics/molding sand powder as described in claim 1, it is characterised in that: step S1 it
In, it is carried out using metal/ceramic/molding sand powder of PIM (powder injection molding molding) dedicated kneading machine/pelletizer to required overlay film
Mixing granulator processing, the kneading machine/pelletizer are that double crank shaft strength kneading machine and mating pelletizer or combined type mixing are made
One of grain all-in-one machine.
3. the preparation method of precoated metal/ceramics/molding sand powder as claimed in claim 2, it is characterised in that: step S2 it
In, broken pulverization process is carried out to particle is kneaded using one of crusher, ball mill or airslide disintegrating mill.
4. the preparation method of precoated metal/ceramics/molding sand powder as claimed in claim 3, it is characterised in that: using air-flow
Pulverizer carries out in the step of being crushed pulverization process to particle is kneaded, comprising:
S21, the broken pulverization process of jet is carried out to mixing particle, obtain corase grinding powder；
S22, first time screening or air current classifying processing are carried out to corase grinding powder, obtain powder to be ground；
S23, jet fine grinding processing is carried out to corase grinding powder, obtains fine grinding powder；
S24, second of screening or air current classifying processing are carried out to fine grinding powder, obtain precoated metal/ceramics/type of required size
Emery dust end.
5. the preparation method of precoated metal/ceramics/molding sand powder as claimed in claim 4, it is characterised in that: step S1 it
In, the size for being kneaded particle is 1-4mm.
6. the preparation method of precoated metal/ceramics/molding sand powder as claimed in claim 5, it is characterised in that: in step S21
Among, the broken pulverization process of jet is carried out to particle is kneaded with the air pressure of 0.3-1.2MPa.
7. the preparation method of precoated metal/ceramics/molding sand powder as claimed in claim 6, it is characterised in that: in step S23
Among, jet fine grinding processing is carried out to particle is kneaded with the air pressure of 0.2-0.8MPa.
8. the preparation method of precoated metal/ceramics/molding sand powder as claimed in claim 7, it is characterised in that: in step S24
Among, the precoated metal/ceramics/molding sand powder diameter screened out is 20-75um.
9. the preparation method of precoated metal/ceramics/molding sand powder as claimed in claim 8, it is characterised in that: in step S23
Among, the processing time that jet fine grinding processing is carried out to corase grinding powder is 5-20min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910446423.9A CN110142401A (en) | 2019-05-27 | 2019-05-27 | Precoated metal/ceramics/molding sand powder preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910446423.9A CN110142401A (en) | 2019-05-27 | 2019-05-27 | Precoated metal/ceramics/molding sand powder preparation method |
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| CN110142401A true CN110142401A (en) | 2019-08-20 |
Family
ID=67593207
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| CN201910446423.9A Pending CN110142401A (en) | 2019-05-27 | 2019-05-27 | Precoated metal/ceramics/molding sand powder preparation method |
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