CN111842893A - Process method for preparing thin-wall irregular annular piece through selective laser melting forming - Google Patents
Process method for preparing thin-wall irregular annular piece through selective laser melting forming Download PDFInfo
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- CN111842893A CN111842893A CN202010696761.0A CN202010696761A CN111842893A CN 111842893 A CN111842893 A CN 111842893A CN 202010696761 A CN202010696761 A CN 202010696761A CN 111842893 A CN111842893 A CN 111842893A
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- thin
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- annular piece
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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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
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- 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
- B33Y10/00—Processes of additive manufacturing
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- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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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 invention relates to a process method for preparing thin-wall irregular ring-shaped parts by selective laser melting forming, which comprises the following steps of S1, selection of forming materials; s2, model processing; s3, setting a laser scanning strategy; s4, design of an auxiliary forming structure: the auxiliary forming structure is characterized in that a layer of blocking piece is tightly grown on two sides of the thin-wall irregular annular piece, the distance between the blocking piece and the thin-wall irregular annular piece is 0.1-0.3mm, the wall thickness of the blocking piece is more than or equal to 0.5mm and is more than 0.5 times of that of the thin-wall irregular annular piece, and the height of the blocking piece is consistent with that of the thin-wall irregular annular piece; s5, setting process parameters; s6, heat treatment; and S7, removing the auxiliary forming structure. The method has the advantages of high forming precision and good effect of preparing the metal thin-wall annular part, can realize the preparation of the high-precision irregular annular structure through the optimized auxiliary forming structure design, does not need to use other auxiliary equipment, and solves the problems of low yield, long production period, complicated working procedures and the like of the traditional preparation process.
Description
Technical Field
The invention relates to the field of selective laser melting, in particular to a process method for preparing a thin-wall irregular annular piece by selective laser melting forming.
Background
With the rapid development of aerospace military equipment, higher requirements are put forward on the development of new materials and new processes. The traditional metal thin-wall irregular annular piece is complex in preparation process and high in processing cost, the precision of the thin-wall annular piece is low, and the thinnest wall thickness of the annular piece is limited. The traditional method for manufacturing the metal thin-wall annular part is to weld a sheet metal after forming into a whole or to punch and form a thin plate, and the two forming processes need additional processing dies, so that the cost is increased, and the production period is prolonged.
Disclosure of Invention
The invention aims to provide a process method for preparing a thin-wall irregular annular piece by selective laser melting forming.
The invention realizes the purpose through the following technical scheme: a process method for preparing a thin-wall irregular annular piece by selective laser melting forming comprises the following steps:
s1, selecting a molding material;
s2, model processing;
s3, setting a laser scanning strategy;
s4, design of an auxiliary forming structure: the auxiliary forming structure is characterized in that a layer of blocking piece is tightly grown on two sides of the thin-wall irregular annular piece, the distance between the blocking piece and the thin-wall irregular annular piece is 0.1-0.3mm, the wall thickness of the blocking piece is more than or equal to 0.5mm and is more than 0.5 times of that of the thin-wall irregular annular piece, and the height of the blocking piece is consistent with that of the thin-wall irregular annular piece;
S5, setting process parameters;
s6, heat treatment;
s7, removing the auxiliary forming structure: after the annular member printed the shaping, along base plate plane cutting back through the line cutting, most supplementary shaping separation blade structure can break away from the annular member automatically, and few partial separation blade is through manual separation.
Further, the material of S1 is mainly copper, iron, nickel, titanium, tungsten, molybdenum, aluminum, gold, and alloys thereof, and ceramic materials, etc.
Further, in step S3, a time-optimized filling manner is adopted, a next local area is sintered after the local area is continuously scanned, and a scanning strategy of the unpatterned overall laser sintering is adopted.
Furthermore, the S5 printing layer has a thickness of 0.02-0.10mm, a laser power of 80W-500W, a laser scanning speed of 500-2000mm/S, a filling distance of 0.08-0.16mm, a laser scanning annular part outer contour, a scanning speed of 800-1700mm, a laser power of 100-400W, and upper skin process parameters, lower skin process parameters and sharp corner process parameters are cancelled or set to 0.
Further, the S6 is subjected to heat preservation for 1 hour at different treatment temperatures according to different material heat under the condition of high vacuum degree, and is rapidly cooled by argon.
Furthermore, after the S7 ring-shaped piece is printed and formed and cut along the plane of the substrate by wire cutting, most of the auxiliary forming baffle structures can automatically separate from the ring-shaped piece, and few parts of the baffles can be separated manually.
Compared with the prior art, the process method for preparing the thin-wall irregular annular piece by selective laser melting forming has the beneficial effects that: the forming precision is high, the effect of preparing the metal thin-wall annular part is good, the preparation of the high-precision irregular annular structure can be realized through the optimized auxiliary forming structure design, other auxiliary equipment is not needed, the direct forming can be realized only through the selective laser melting equipment, and the problems of the traditional preparation process, low yield, long production period, complex procedures and the like are solved.
Drawings
Fig. 1 is a structural schematic diagram of a thin-wall irregular annular member.
Fig. 2 is a schematic structural diagram of a thin-wall irregular annular piece and an auxiliary forming structure.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a partially enlarged view of fig. 3.
In the figure, 1 is a thin-wall irregular annular part, 2 is an auxiliary forming structure, and 3 is a space.
Detailed Description
Referring to fig. 1 to 4, a process method for preparing a thin-wall irregular annular part by selective laser melting forming comprises the following steps:
s1, selection of molding materials: the metal thin-wall irregular annular piece is prepared by using a selective laser melting forming process, and the materials of the irregular annular piece mainly comprise copper, iron, nickel, titanium, tungsten, molybdenum, aluminum, gold, alloys thereof, ceramic materials and the like.
S2, model processing: and converting the digital analogy into an STL format in UG NX software, and then importing the digital analogy into Magics software for subsequent data processing such as file repair, placement, support, slicing and the like.
S3, setting a laser scanning strategy: the printing forming efficiency is improved, and the laser beam idle running distance is reduced, so that a time optimization filling mode is adopted, a next local area is sintered after the local area is continuously scanned, and a scanning strategy of non-pattern integral laser sintering is adopted. During laser sintering, the sputtered metal steam condensate can fall on a flat metal powder bed along the wind direction, and the mode of preferentially sintering the part close to the air suction opening is adopted, so that the phenomenon of poor fusion inside the part caused by remelting the metal condensate can be avoided. After each layer is sintered, the rotation angle of the whole laser sintering surface is 67 degrees after the powder is spread again, the upper and lower sintering layers are prevented from being completely overlapped as much as possible, and the anisotropy is reduced.
S4, design of an auxiliary forming structure: the thin-wall irregular annular parts directly printed by selective laser melting are not easy to form, so that the design of an auxiliary forming structure is very necessary. The auxiliary forming structure 2 is formed by closely growing a layer of blocking piece on two sides of the thin-wall irregular ring piece, the distance 3 between the blocking piece and the thin-wall irregular ring piece 1 is 0.1-0.3mm, the wall thickness of the blocking piece is more than 0.5mm, the height of the blocking piece is consistent with that of the thin-wall irregular ring piece, the deformation generated in the printing process of the thin-wall irregular ring piece can be effectively resisted, the forming of the thin-wall irregular ring piece structure can be assisted, the phenomenon that a forming surface of the outermost layer of the thin-wall irregular ring piece is clamped in the printing process in the direction opposite to a scraper is particularly avoided, and the printing forming is ensured.
S5, setting process parameters: the printing process of the thin-wall irregular annular piece is mainly applied to a plurality of process instructions, including: and the process parameters of solid filling of the annular piece and the process parameters of solid filling of the auxiliary forming baffle piece.
The thickness of the printing layer is 0.02-0.10mm, and the parameters of the entity filling process comprise: laser power, laser scan speed, fill pitch, etc. The optimized process method selects the laser power of 80W-500W, the smaller power can be suitable for the small-layer-thickness thin-wall annular structure, and the larger power is suitable for the large-layer-thickness thick-wall annular piece. The laser scanning speed is 500-2000mm/s, and the lower laser scanning speed can improve the laser energy density, so that the material tissue is compact, and the poor interlayer fusion phenomenon is avoided. The filling space is 0.08-0.16 mm. The laser scans the outer contour of the annular part, the scanning speed is 800-. The upper skin process parameters, the lower skin process parameters and the sharp corner process parameters should be cancelled or the laser power should be set to 0.
S6, heat treatment: in order to reduce the internal stress of the material and effectively control the outline dimension precision, after printing and forming, the annular piece and the substrate are subjected to heat treatment before cutting and separating. Under the condition of high vacuum degree, the heat treatment temperature of different materials is as follows, wherein the aluminum alloy is 200-.
S7, removing the auxiliary forming structure: after the annular member printed the shaping, along base plate plane cutting back through the line cutting, most supplementary shaping separation blade structure can break away from the annular member automatically, and few partial separation blade is through manual separation.
The invention has high forming precision and good effect of preparing the metal thin-wall annular part, can realize the preparation of a high-precision irregular annular structure by an optimized auxiliary forming structure design, does not need to use other auxiliary equipment, can directly form by only laser selective melting equipment, and solves the problems of low yield, long production period, complicated working procedures and the like of the traditional preparation process. The prepared metal thin-wall annular part can be applied to the fields of aerospace, war industry, automobiles, chemical engineering and the like.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A process method for preparing a thin-wall irregular annular part by selective laser melting forming is characterized by comprising the following steps:
s1, selecting a molding material;
s2, model processing;
s3, setting a laser scanning strategy;
s4, design of an auxiliary forming structure: the auxiliary forming structure is characterized in that a layer of blocking piece is tightly grown on two sides of the thin-wall irregular annular piece, the distance between the blocking piece and the thin-wall irregular annular piece is 0.1-0.3mm, the wall thickness of the blocking piece is more than or equal to 0.5mm and is more than 0.5 times of that of the thin-wall irregular annular piece, and the height of the blocking piece is consistent with that of the thin-wall irregular annular piece;
s5, setting process parameters;
s6, heat treatment;
and S7, removing the auxiliary forming structure.
2. The process method for preparing the thin-wall irregular annular piece by selective laser melting forming according to claim 1, wherein the process method comprises the following steps: the S1 mainly comprises copper, iron, nickel, titanium, tungsten, molybdenum, aluminum, gold and alloy thereof, ceramic material and the like.
3. The process method for preparing the thin-wall irregular annular piece by selective laser melting forming according to claim 1, wherein the process method comprises the following steps: and S3, sintering the next local area after the local area is continuously scanned in a time-optimized filling mode, and adopting a scanning strategy of non-pattern overall laser sintering.
4. The process method for preparing the thin-wall irregular annular piece by selective laser melting forming according to claim 1, wherein the process method comprises the following steps: the S5 printing layer is 0.02-0.10mm thick, the laser power is 80-500W, the laser scanning speed is 500-2000mm/S, the filling distance is 0.08-0.16mm, the laser scanning annular part outer contour is 800-1700mm, the laser power is set to be 100-400W, the upper surface process parameter, the lower surface process parameter and the sharp corner process parameter are cancelled or the laser power is set to be 0.
5. The process method for preparing the thin-wall irregular annular piece by selective laser melting forming according to claim 1, wherein the process method comprises the following steps: and the S6 is subjected to heat preservation for 1 hour at different treatment temperatures according to different material heat under the condition of high vacuum degree, and is rapidly cooled by argon.
6. The process method for preparing the thin-wall irregular annular piece by selective laser melting forming according to claim 1, wherein the process method comprises the following steps: after the S7 annular piece is printed and formed and is cut along the plane of the substrate by wire cutting, most of the auxiliary forming separation blade structures can automatically separate from the annular piece, and few part of the separation blades are manually separated.
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| CN202010696761.0A CN111842893A (en) | 2020-07-20 | 2020-07-20 | Process method for preparing thin-wall irregular annular piece through selective laser melting forming |
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| CN202010696761.0A CN111842893A (en) | 2020-07-20 | 2020-07-20 | Process method for preparing thin-wall irregular annular piece through selective laser melting forming |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496341A (en) * | 2020-11-27 | 2021-03-16 | 西安航天发动机有限公司 | Laser selective melting forming and post-processing method for thin-wall interlayer cooling structure |
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|---|---|---|---|---|
| US20190061259A1 (en) * | 2017-08-31 | 2019-02-28 | Safran Landing Systems | Method of unclogging ducts in parts obtained by additive manufacturing |
| CN110239092A (en) * | 2019-05-17 | 2019-09-17 | 航发优材(镇江)增材制造有限公司 | A kind of selective laser fusing shapes the process of irregular thin-walled plate |
| CN111347044A (en) * | 2020-03-20 | 2020-06-30 | 航发优材(镇江)增材制造有限公司 | Selective laser melting preparation process method for metal capillary material |
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2020
- 2020-07-20 CN CN202010696761.0A patent/CN111842893A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190061259A1 (en) * | 2017-08-31 | 2019-02-28 | Safran Landing Systems | Method of unclogging ducts in parts obtained by additive manufacturing |
| CN110239092A (en) * | 2019-05-17 | 2019-09-17 | 航发优材(镇江)增材制造有限公司 | A kind of selective laser fusing shapes the process of irregular thin-walled plate |
| CN111347044A (en) * | 2020-03-20 | 2020-06-30 | 航发优材(镇江)增材制造有限公司 | Selective laser melting preparation process method for metal capillary material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496341A (en) * | 2020-11-27 | 2021-03-16 | 西安航天发动机有限公司 | Laser selective melting forming and post-processing method for thin-wall interlayer cooling structure |
| CN112496341B (en) * | 2020-11-27 | 2023-01-10 | 西安航天发动机有限公司 | Laser selective melting forming and post-processing method for thin-wall interlayer cooling structure |
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