CN103769586A - Metal 3D printing product production method by means of low-power laser sintering - Google Patents
Metal 3D printing product production method by means of low-power laser sintering Download PDFInfo
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- CN103769586A CN103769586A CN201310605634.5A CN201310605634A CN103769586A CN 103769586 A CN103769586 A CN 103769586A CN 201310605634 A CN201310605634 A CN 201310605634A CN 103769586 A CN103769586 A CN 103769586A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a metal 3D printing product production method by means of low-power laser sintering. According to the metal 3D printing product production method, metal powder materials and thermoplastic molding adhesives are adopted to prepare a low-melting-point 3D metal printing raw material mixture; due to the fact that the thin-layer thermoplastic adhesives are formed on the surfaces of metal powder particles, low-power (smaller than 50 W) selective laser sintering or electron beam sintering 3D printer is used, the metal powder materials are stacked to be molded through surface layer thermoplastic adhesive low-temperature melting-cooling adhesive solidification, then metal part product green bodies can be printed through the prepared metal powder raw materials, the molded adhesives in the part green bodies are removed through thermal debinding or chemocatalysis debinding or other technologies, high-temperature sintering is conducted on the green bodies without the molded adhesives through a vacuum sintering method or an atmosphere protection sintering method, and alloying compact high-performance complex metal part products are produced. The metal 3D printing product production method by means of low-power laser sintering has the advantage that the 3D printing device and technology for producing the metal parts are low in cost.
Description
Technical field
The present invention relates to a kind of metal dust that adopts and add thermoplasticity organic adhesive, by the low-power property selected, laser sintered or electron-beam sintering method 3D printer is printed the metal product green compact containing bonding agent, then by removing the method and apparatus of green compact binding agent, the densified production metallic element of high temperature sintering alloying product.
Background technology
3D prints the one that production technology belongs to near-net-shape increasing material manufacturing technology, its principle is by software, the three-dimensional parts sterogram of Computer Design to be resolved into some layer planes to cut into slices, print out by 3D printer, produce the required parts product of unlike material; Because of its flexibility, customization, all many advantages of the unlike material parts of near-net-shape production structure complexity fast, become a kind of increasing material manufacturing technology that has development prospect, aspect integrated manufacturing system (IMS) global formation, the complicated metallic element integral module of direct production high-performance, having peculiar advantage especially.
Current similar 3D prints near-net-shape increasing material manufacture manufacturing technology and is able to develop rapidly in the whole world, and tentatively the production method of commercialization mainly contains laser stereoforming method, selective laser sintering method, selective electronic bundle sintering process, watery fusion lamination method etc.
It is to utilize dusty material that 3D prints selective laser/electron-beam sintering method technique, mainly contain thermoplastic macromolecule material powder, metal dust, ceramic powders etc., under computer control, laser/electron beam carries out selective interface irradiation sintering to powder layering, and pile up layer by layer moulding, one of the main method that increases material and manufacture near-net-shape, parts that can production various material Arbitrary 3 D shape.
Due to metal molten or sintering temperature high, the laser generator power using by laser formation method and electron-beam sintering method or electron beam generation power are very large, the laser generator power of selective laser sintering method is generally more than 200W, superpower laser production technology difficulty is large, cost costliness, extensive commercial investment is large, plant maintenance complexity, and threshold is high.And the 3D that utilizes part mature technology to develop a kind of low cost mode prints the metallic element equipment and process demand that become a reality of producing.
Summary of the invention
In order to solve current 3D printing technique cost costliness, the shortcoming of plant maintenance complexity, the present invention develops a kind of low power laser sintering process metal 3D printed product production method.
The present invention adopts the method for metal powder material heating plastic forming adhesive, prepare the 3D metal of low melting point and print raw material compound, because metal powder granulates surface forms thin layer thermoplastic adhesive, by low-power (being less than 50W) selective laser sintering or electron-beam sintering method 3D printer, the thin layer thermoplastic adhesive on metal dust top layer is through low temperature thawing-cooling adhesive solidification process, and pile up layer by layer moulding, just can use these type of metal dust raw material of preparation, print metallic element product green compact, green compact parts remove the forming adhesive in green compact parts by techniques such as hot degreasing method or chemical catalysis degreasing methods, remove the green compact high temperature sintering after molding adhesive by vacuum-sintering or gas-protecting sintering method again, produce the complicated metallic element product of high-performance of alloying densification.
Production process of the present invention:
Metal powder material+thermoplastic molding binding agent---forming metal powder mixture mixes---fragmentation---low-power selective laser sintering or electron-beam sintering method 3D printer are printed and produced parts green compact---green compact remove binding agent---high temperature sintering---metallic element product
Thermoplastic molding's binding agent function: increase 3D and print the raw-material low-temperature thermoplastic of required metal dust and maintain forming shape.
More than the technical method of invention is not only printed and is produced for the 3D of metal, and the 3D of various ceramic materials prints and is also applicable to the low power laser sintering process 3D printed product production that the technology of the present invention is used.
The specific embodiment
Below in conjunction with specific embodiment, this invention is described.
Printing Titanium alloy Ti-6Al-4V (TC4) material metallic element product with 3D is that example is described as follows:
One. the preparation of thermoplastic molding's metal dust compound
(1) Titanium alloy Ti-6Al-4V (TC4) trade mark globular metallic powder of selection average grain diameter D50=25 μ m
(2) thermoplastic molding's Binder Composition: 50% paraffin+50% polyethylene
(3) mixing: 60% metal dust content+40% molding adhesive volume content, with 5 kilograms of screw mixing machines, temperature mixing 20KG compound below 120 ℃ 20 hours.
Two. fragmentation
The metal dust mixing mixes agglomerating, adopts airslide disintegrating mill to be broken into subparticle, below general control granularity 50um.
Three .3D printing shaping metallic element green compact
(1) select the lower powered selective laser sintering 3D of commercialization laser instrument 40W printer, laser sintered temperature is controlled at below 200 ℃, Photocopy Room temperature is controlled in 80 ℃, the metal dust compound with thermoplastic characteristics produces powder surface binding agent thawing-cooled and solidified process under the irradiation of laser facula, and piles up layer by layer moulding.
(2) the 3-dimensional metal parts product model that utilizes professional 3D print software to design in computer will to print, arranges print parameters, 3D printer printing shaping parts green compact.
Four. parts green compact molding adhesive removes
In special hot debinding furnace, heated the removing of binding agent in metallic element green compact, sets heating process curve in this process, control heating rate, guarantees that binding agent removes totally, and parts green compact are indeformable.
Five. remove parts green compact molding adhesive final vacuum sintering
The titanium alloy member green compact that remove binding agent are put into vacuum sintering furnace, according to this Titanium alloy Ti-6Al-4V (TC4) material, liquid-phase sintering Temperature Setting is 1250 ℃, formulate sintering temperature curve, parts green compact are carried out to high temperature sintering, the densified alloying of green compact product sintering shrinkage, produces Titanium alloy Ti-6Al-4V (TC4) the metallic element product of certain mechanical performance.
Claims (8)
1. a low power laser sintering process metal 3D printed product production method, it is characterized by and adopt metal dust to add thermoplasticity organic adhesive, laser sintered or the electron-beam sintering method 3D printer printing metal product green compact by the low-power property selected, then by removing the method and apparatus of its green compact binding agent, the densified production metallic element of high temperature sintering alloying product.
2. a kind of low power laser sintering process metal 3D printed product production method as claimed in claim 1, is characterized by: printed material is thermoplastic molding's metal dust compound, and composition is that metal dust adds thermal plastic high polymer binder material.
3. a kind of low power laser sintering process metal 3D printed product production method as claimed in claim 1, it is characterized by: select the lower powered selective laser sintering 3D of commercialization laser instrument 50W printer, laser sintered temperature is controlled at below 200 ℃, Photocopy Room temperature is controlled in 80 ℃, the metal dust compound with thermoplastic characteristics produces powder surface binding agent and melts under the irradiation of laser facula---cooled and solidified process, and pile up layer by layer moulding.
4. a kind of low power laser sintering process metal 3D printed product production method as claimed in claim 1, it is characterized by: in special degreasing equipment, binding agent in metallic element green compact is removed, in this process, set heating process curve, control heating rate, guarantee that binding agent removes totally, parts green compact are indeformable.
5. a kind of low power laser sintering process metal 3D printed product production method as claimed in claim 1, it is characterized by: the parts green compact that remove binding agent are put into sintering furnace, formulate sintering temperature curve, parts green compact are carried out to densified high temperature sintering, green compact product sintering shrinkage is densified, produces the parts product of certain mechanical performance.
6. a kind of low power laser sintering process metal 3D printed product production method as claimed in claim 1, is characterized by: production process is: metal powder material+thermoplastic molding binding agent---forming metal powder mixture mixes---fragmentation---low-power selective laser sintering or electron-beam sintering method 3D printer are printed and produced parts green compact---green compact remove binding agent---high temperature sintering---metallic element product.
7. a kind of low power laser sintering process metal 3D printed product production method as claimed in claim 1, it is characterized by: technical method of the present invention is not only printed and produced for the 3D of metal, the 3D of various ceramic materials prints and is also applicable to the low power laser sintering process 3D printed product production that the technology of the present invention is used.
8. a kind of low power laser sintering process metal 3D printed product production method as claimed in claim 1, it is characterized by: thermoplastic molding's organic binder bond composition: 50% paraffin+50% polyethylene, in this technical method, using thermoplastic molding's organic binder bond is to print the raw-material low-temperature thermoplastic of required metal dust and maintain forming shape in order to increase 3D, the selection of binding agent is diversity, as long as application target and method meet the principle category of the technology of the present invention, all belong to the claim scope of the technology of the present invention.
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| CN201310605634.5A CN103769586A (en) | 2013-11-26 | 2013-11-26 | Metal 3D printing product production method by means of low-power laser sintering |
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| CN201310605634.5A CN103769586A (en) | 2013-11-26 | 2013-11-26 | Metal 3D printing product production method by means of low-power laser sintering |
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| CN105798295A (en) * | 2016-03-22 | 2016-07-27 | 西安铂力特激光成形技术有限公司 | Preparation method for molybdenum and molybdenum alloy part |
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| CN105921751A (en) * | 2016-02-19 | 2016-09-07 | 珠海天威飞马打印耗材有限公司 | Three-dimensional printer and printing method thereof |
| CN106001571A (en) * | 2016-07-07 | 2016-10-12 | 四川天塬增材制造材料有限公司 | Metal part selective laser alloying additive manufacturing method |
| CN106239923A (en) * | 2016-08-11 | 2016-12-21 | 安徽鸿昇3D技术应用研究院有限公司 | A kind of opera helmet cap and processing technology thereof |
| CN106334793A (en) * | 2016-11-08 | 2017-01-18 | 西安铂力特激光成形技术有限公司 | Method for Producing Parts with Tantalum and Tantalum Alloy |
| CN106426916A (en) * | 2016-10-27 | 2017-02-22 | 南方科技大学 | 3D (three-dimensional) printing method |
| TWI580567B (en) * | 2014-05-19 | 2017-05-01 | Yu Chen | Method and article for forming metal / ceramic article with no laser sintering powder lumping device |
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Application publication date: 20140507 |