CN105397494A - Laser coaxial powder feeding composite manufacturing machine tool and workpiece composite manufacturing method - Google Patents

Laser coaxial powder feeding composite manufacturing machine tool and workpiece composite manufacturing method Download PDF

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Publication number
CN105397494A
CN105397494A CN201510918480.4A CN201510918480A CN105397494A CN 105397494 A CN105397494 A CN 105397494A CN 201510918480 A CN201510918480 A CN 201510918480A CN 105397494 A CN105397494 A CN 105397494A
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CN
China
Prior art keywords
composite
nozzle
workpiece
defects detection
lathe
Prior art date
Application number
CN201510918480.4A
Other languages
Chinese (zh)
Inventor
张璧
白倩
杜巍
黄鑫
郭东明
Original Assignee
大连理工大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority to CN2015108848422 priority Critical
Priority to CN201510884842 priority
Application filed by 大连理工大学 filed Critical 大连理工大学
Priority to CN201510918480.4A priority patent/CN105397494A/en
Publication of CN105397494A publication Critical patent/CN105397494A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P23/00Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B23P23/04Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F10/00Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20Direct sintering or melting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F10/00Additive manufacturing of workpieces or articles from metallic powder
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F10/00Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/10Formation of a green body
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F10/00Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30Process control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00Arrangements for observing, indicating or measuring on machine tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F2003/247Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention discloses a laser coaxial powder feeding composite manufacturing machine tool which comprises a cradle type workbench, a spindle, a material additive manufacturing mechanism, a material reducing machining mechanism and an online defect detection mechanism. The material additive manufacturing mechanism comprises a nozzle and a powder feeding device connected with the nozzle. A laser head is arranged at the position of the nozzle and connected with a laser generator. The material additive manufacturing mechanism is clamped by a nozzle bracket. The material reducing machining mechanism comprises a tool, a tool magazine and a tool changing bracket. The online defect detection mechanism comprises a defect detection head and a detection signal collection and analysis system. The invention further discloses a workpiece composite manufacturing method. The process of the workpiece composite manufacturing method mainly comprises the steps that material additive manufacturing, online defect detection and material reducing machining are carried out cyclically, and finally composite manufacturing is completed. By means of compounding of material additive manufacturing, material reducing machining and online defect detection, one-time forming of workpieces high in size precision and surface quality and low in internal defect is guaranteed, the production period is effectively shortened, and the part manufacturing quality and precision are guaranteed.

Description

A kind of laser coaxial powder feeding composite manufacturing lathe and workpiece composite manufacturing method
Technical field
The present invention relates to machine tool technology field, be specifically related to a kind of laser coaxial powder feeding composite manufacturing lathe and workpiece composite manufacturing method.
Background technology
Along with Aero-Space, nuclear power source, ocean engineering manufacturing industry are day by day urgent to the demand of accurate complex parts, the increasing material manufacturing technology of rising at present with it flexibly, feature efficiently, be rapidly developed in the manufacture of complex parts.But the complex parts dimensional accuracy that increasing material manufactures and surface quality are often lower than actual requirement, after increasing material forming, need in traditional machine tool, carry out secondary subtracting material (as cut) processing.Due to needs secondary clamping and base weight new definition, cause that workpiece size precision and form accuracy are not high, production efficiency is low, cost increases.Increase the parts often more complicated that material manufactures, the material that subtracts for these parts is processed more difficult, even may.Increase material manufacture after the inside and outside rough surface of parts, and containing microfissure, do not melt or the defect such as powder, pore, impurity of partial melting.These defects probably cause the fatigue rupture of shed powder blocking or parts thus cause parts to lose efficacy in follow-up use procedure.In addition, even if under rational fabrication process parameters, the inside of parts also has random manufacturing defect (as pore, impurity, crackle etc.) and produces, and these defects need detected in the manufacture process of parts and remove.Generally speaking, the quality and the precision that how to improve increasing material manufacture parts increase problem demanding prompt solution in material Manufacturing Technology Development and application.
Summary of the invention
The present invention is directed to existing increasing material set forth above to manufacture the quality existing defects of parts and be difficult to the problem of control accuracy, research and design a kind of laser coaxial powder feeding composite manufacturing lathe and workpiece composite manufacturing method.The technological means that the present invention adopts is as follows:
A kind of laser coaxial powder feeding composite manufacturing lathe, comprise cradle-type workbench, main shaft, increase device for producing material structure, subtract material organisation of working and defect on-line checkingi mechanism, described lathe is provided with cradle-type workbench, described main shaft is arranged at the top of cradle-type workbench, the dust feeder that described increasing device for producing material structure comprises nozzle and is connected with nozzle, described nozzle place is provided with laser head, described laser head is connected with laser generator, described increasing device for producing material structure is clamped by nozzle bracket, nozzle can be arranged on main shaft and also nozzle can be unloaded from main shaft by described nozzle bracket, the described material organisation of working that subtracts comprises cutter, tool magazine and tool changing bracket, the defect detection signal gather and analysis system that described defects detection mechanism comprises defects detection head and is connected with described defects detection head.
Further, described main shaft, increasing device for producing material structure, subtract material organisation of working and defect on-line checkingi mechanism controls by digital control system.
Further, be placed with cutter and the defects detection head of different size in described tool magazine, described tool magazine is also connected with digital control system, and described tool changing bracket can pick and place cutter and defects detection head from tool magazine.
Further, described cradle-type workbench can rotate around horizontal axis and vertical axis.
Further, described nozzle is coaxial powder-feeding nozzle.
Further, described defects detection head is vortex sensor.
A kind of workpiece composite manufacturing method, comprises the steps:
1. the increasing material manufacture of certain number of plies is carried out on metallic substrates;
2. subtract material processing and remove blemish, for follow-up EDDY CURRENT provides smooth detection plane;
3. Inner Defect Testing is carried out to workpiece portion, if there is internal flaw, subtract material processing and remove internal flaw, if there is no internal flaw, repeat step 1., 2. and 3. until complete the manufacture of whole workpiece.
Further, step 3. in, Inner Defect Testing is carried out to workpiece portion, if there is internal flaw, material processing is subtracted to defect area, removes defect area, and again carry out the manufacture of increasing material removing the position of defect area.
Compared with the prior art, a kind of composite manufacturing lathe of the present invention and workpiece composite manufacturing method have the following advantages:
1, by increasing material manufacture, subtracting the compound of material processing and defect on-line checkingi, ensure to there is high dimensional accuracy, great surface quality, the workpiece of low internal flaw once-forming.
2, the present invention under workpiece one-time positioning condition, can realize efficient, accurate increasing material and subtracts material integration composite manufacturing, effectively shorten the production cycle, ensure complex parts workmanship and precision.
Accompanying drawing explanation
Fig. 1 is the structural representation of the laser coaxial powder feeding composite manufacturing lathe described in the embodiment of the present invention.
Fig. 2 is the workpiece composite manufacturing method flow chart described in the embodiment of the present invention.
Detailed description of the invention
As shown in Figure 1, a kind of composite manufacturing lathe, comprise cradle-type workbench 14, main shaft 8, increase device for producing material structure, subtract material organisation of working and the defects detection mechanism that can carry out on-line checkingi to workpiece, defect, described lathe is provided with cradle-type workbench 14, described workbench 14 can rotate around horizontal axis and vertical axis, described main shaft 8 is arranged at the top of workbench 14, the dust feeder 4 that described increasing device for producing material structure comprises nozzle 7 and is connected with nozzle 7, described nozzle 7 place is provided with laser head 6, in the present embodiment, nozzle 7 is coaxial powder-feeding nozzle, described laser head 6 is connected with laser generator 5 by optical fiber 3, described increasing device for producing material structure is clamped by nozzle bracket 2, nozzle 7 can be arranged on main shaft 8 or by nozzle and unload from main shaft 8 by described nozzle bracket 2, the described material processing assembly that subtracts comprises cutter 11, tool magazine 12 and tool changing bracket 9, described defects detection mechanism comprises defects detection 10 and defect detection signal gather and analysis system 13, under the state do not used, described cutter 11 and defects detection 10 is positioned in tool magazine 12, during use, described tool changing bracket 9 can pick and place cutter 11 and defects detection 10 and unload at the enterprising luggage of main shaft 8 from tool magazine 12.
Described defects detection 10 is vortex sensor.EDDY CURRENT utilizes electromagnetic induction principle, by measuring the Swirl intensity retention that tested electrically conductive workpiece is inducted under alternating magnetic field incentive action, carry out the lossless detection method having zero defect in harmless this workpiece of detection or evaluate its state of the art, there is quantification and efficient feature, therefore can be applied in the defects detection module of increase and decrease material composite manufacturing.
Described main shaft 8, increase device for producing material structure, subtract material organisation of working and online defects detection mechanism controls by digital control system 1, described tool magazine 12 is also connected with digital control system 1.
As shown in Figure 2, a kind of workpiece composite manufacturing method, uses the composite manufacturing lathe described in the present embodiment, comprises the steps:
1. nozzle 7 and laser head 6 are installed on main shaft 8 by digital control system 1 Control Nozzle bracket 2, carry out the increasing material manufacture of certain number of plies on metallic substrates;
2. digital control system 1 Control Nozzle bracket 2 unloads the nozzle 7 on main shaft 8, control tool changing bracket 9 cutter 11 of correspondence is taken out from tool magazine 12 and is installed on main shaft 8, the workpiece portion that 1. step obtains is subtracted to material processing removal blemish and improves workpiece surface quality;
3. digital control system 1 controls tool changing bracket 9 and tool magazine 12 unloads cutter 11, and defective mounting detection head 10 carries out Inner Defect Testing to workpiece portion on main shaft 8, if there is internal flaw, then digital control system obtains defects detection head current location and defective locations and size, digital control system 1 controls tool changing bracket 9 and tool magazine 12 and unloads defects detection 10, and mounting cutter 11 is on main shaft 8, digital control system 1 controls main shaft 8 and carries out subtracting material processing removal internal flaw place passage or region, and again carries out the manufacture of increasing material in this passage or region; If there is no internal flaw, then digital control system 1 controls tool changing bracket 9 and defects detection 10 is unloaded from main shaft 8, puts back to tool magazine 12, repeats step 1., 2. and 3. until complete the manufacture of whole workpiece.The region of removing internal flaw owing to subtracting material is one or several increasing material passages at this defect place, therefore, can not have remarkable impact to follow-up manufacture process.
The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.

Claims (8)

1. a laser coaxial powder feeding composite manufacturing lathe, is characterized in that: comprise
Cradle-type workbench;
Main shaft, described main shaft is arranged at the top of cradle-type workbench;
Increase device for producing material structure, the dust feeder that described increasing device for producing material structure comprises nozzle and is connected with nozzle, described nozzle place is provided with laser head, described laser head is connected with laser generator, described increasing device for producing material structure is clamped by nozzle bracket, and nozzle can be arranged on main shaft and also nozzle can be unloaded from main shaft by described nozzle bracket;
Subtract material organisation of working, described in subtract material organisation of working comprise cutter, tool magazine and and tool changing bracket; And
The defects detection mechanism of on-line checkingi can be carried out, the detection signal gather and analysis system that described defects detection mechanism comprises defects detection head and is connected with described defects detection head to workpiece, defect.
2. composite manufacturing lathe according to claim 1, is characterized in that: described main shaft, increasing device for producing material structure, subtract material organisation of working and defects detection mechanism controls by digital control system.
3. composite manufacturing lathe according to claim 1, is characterized in that: the cutter and the defects detection head that are placed with different size in described tool magazine, and described tool magazine is also connected with digital control system, and described tool changing bracket can pick and place cutter and defects detection head from tool magazine.
4. composite manufacturing lathe according to claim 1, is characterized in that: described cradle-type workbench can rotate around horizontal axis and vertical axis.
5. composite manufacturing lathe according to claim 1, is characterized in that: described nozzle is coaxial powder-feeding nozzle.
6. according to the composite manufacturing lathe in claim 1-5 described in any one, it is characterized in that: described defects detection head is vortex sensor.
7. a workpiece composite manufacturing method, is characterized in that: comprise the steps:
1. according to technique, the increasing material manufacture of certain number of plies is carried out on metallic substrates;
2. subtract material processing and remove blemish;
3. Inner Defect Testing is carried out to workpiece portion, if there is internal flaw, subtract material processing and remove internal flaw, if there is no internal flaw, repeat step 1., 2. and 3. until complete the manufacture of whole workpiece.
8. workpiece composite manufacturing method according to claim 7, is characterized in that: step 3. in, Inner Defect Testing is carried out to workpiece portion, if there is internal flaw, material processing is subtracted to defect area, removes defect area, and again carry out the manufacture of increasing material in the position of removing defect area.
CN201510918480.4A 2015-12-03 2015-12-10 Laser coaxial powder feeding composite manufacturing machine tool and workpiece composite manufacturing method CN105397494A (en)

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CN2015108848422 2015-12-03
CN201510884842 2015-12-03
CN201510918480.4A CN105397494A (en) 2015-12-03 2015-12-10 Laser coaxial powder feeding composite manufacturing machine tool and workpiece composite manufacturing method

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106001563A (en) * 2016-06-25 2016-10-12 成都雍熙聚材科技有限公司 3D printing device with nondestructive inspection function
CN106044702A (en) * 2016-04-29 2016-10-26 电子科技大学 An etching and surface material increasing composite processing device and a method of performing silicon substrate patch antenna processing by utilizing the device
CN106311876A (en) * 2016-11-15 2017-01-11 山东大学 Complicated thin-walled workpiece formation system and method based on progressive formation and additive manufacturing
CN106735216A (en) * 2016-12-30 2017-05-31 华中科技大学 The increase and decrease material composite manufacturing equipment and method of a kind of metal parts
CN106770634A (en) * 2016-12-08 2017-05-31 大连理工大学 A kind of metal material high energy beam increases and decreases the online EDDY CURRENT combined machining method of material
CN107127583A (en) * 2017-05-17 2017-09-05 大连理工大学 Ultrasonic cutting is applied to the equipment and processing method in powder feeding formula increase and decrease material composite manufacturing
CN107876771A (en) * 2017-12-22 2018-04-06 大连大学 A kind of metal laser melting increasing material manufacturing method
CN107962181A (en) * 2016-10-20 2018-04-27 日本电产株式会社 Moulding material producing device, moulder manufacture method and moulder
CN108340161A (en) * 2017-01-24 2018-07-31 昆山快成三维科技有限公司 A kind of 3D printing nozzle support device towards wire fused glass pellet with brill milling compounding machine bed
CN108941558A (en) * 2018-07-25 2018-12-07 广东大族粤铭激光集团股份有限公司 Deng increase and decrease material composite forming apparatus and its processing method
CN108941557A (en) * 2018-07-25 2018-12-07 广东大族粤铭激光集团股份有限公司 Materials composite forming apparatus and its manufacturing process such as increasing
CN109175367A (en) * 2018-10-25 2019-01-11 武汉钢铁有限公司 Increase material, etc. materials composition metal 3D laser forming device and its method
CN109317672A (en) * 2018-10-16 2019-02-12 北京星航机电装备有限公司 A kind of increase and decrease material composite manufacturing and online dimension detection device based on powder bed melting increases material manufacturing technology
CN109351967A (en) * 2017-08-06 2019-02-19 江苏尤尼特激光智能装备有限公司 A kind of increase and decrease material laser process machine and its application method
CN109420762A (en) * 2017-08-31 2019-03-05 上海微电子装备(集团)股份有限公司 A kind of 3D printing device and method
CN109530689A (en) * 2018-11-26 2019-03-29 西安增材制造国家研究院有限公司 Reinforcing elements, increasing material processing unit (plant) and processing method with online strengthening effect
CN109746443A (en) * 2018-12-29 2019-05-14 华中科技大学 A kind of method of parallel control part deformation and precision during increasing material manufacturing
WO2019136731A1 (en) * 2018-01-15 2019-07-18 大连理工大学 Manufacturing method for microstructure
CN110052713A (en) * 2019-03-22 2019-07-26 江南大学 Part increases and decreases material composite manufacturing technology

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US20150017054A1 (en) * 2013-07-09 2015-01-15 MTU Aero Engines AG Control in generative production
CN104384936A (en) * 2014-09-18 2015-03-04 大连理工大学 Combined additive and subtractive manufacturing machine tool
CN104493491A (en) * 2014-12-12 2015-04-08 华南理工大学 Equipment and method for single-cylinder type selective laser melting and milling composite processing
CN104493492A (en) * 2014-12-12 2015-04-08 华南理工大学 Selective laser melting (SLM) and milling compound machining equipment and selective laser melting and milling compound machining method

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JPH10263958A (en) * 1997-03-21 1998-10-06 Toyota Gakuen Metal working method and metal working machine
CN102672251A (en) * 2012-05-21 2012-09-19 浙江开宇钎具有限公司 Processing equipment of 1-shaped rock drilling drill bit milling alloy grooves
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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106044702A (en) * 2016-04-29 2016-10-26 电子科技大学 An etching and surface material increasing composite processing device and a method of performing silicon substrate patch antenna processing by utilizing the device
CN106001563A (en) * 2016-06-25 2016-10-12 成都雍熙聚材科技有限公司 3D printing device with nondestructive inspection function
CN107962181A (en) * 2016-10-20 2018-04-27 日本电产株式会社 Moulding material producing device, moulder manufacture method and moulder
CN106311876A (en) * 2016-11-15 2017-01-11 山东大学 Complicated thin-walled workpiece formation system and method based on progressive formation and additive manufacturing
CN106770634A (en) * 2016-12-08 2017-05-31 大连理工大学 A kind of metal material high energy beam increases and decreases the online EDDY CURRENT combined machining method of material
CN106735216A (en) * 2016-12-30 2017-05-31 华中科技大学 The increase and decrease material composite manufacturing equipment and method of a kind of metal parts
CN106735216B (en) * 2016-12-30 2018-11-02 华中科技大学 A kind of the increase and decrease material composite manufacturing equipment and method of metal parts
CN108340161A (en) * 2017-01-24 2018-07-31 昆山快成三维科技有限公司 A kind of 3D printing nozzle support device towards wire fused glass pellet with brill milling compounding machine bed
CN107127583A (en) * 2017-05-17 2017-09-05 大连理工大学 Ultrasonic cutting is applied to the equipment and processing method in powder feeding formula increase and decrease material composite manufacturing
CN109351967A (en) * 2017-08-06 2019-02-19 江苏尤尼特激光智能装备有限公司 A kind of increase and decrease material laser process machine and its application method
CN109420762A (en) * 2017-08-31 2019-03-05 上海微电子装备(集团)股份有限公司 A kind of 3D printing device and method
CN107876771A (en) * 2017-12-22 2018-04-06 大连大学 A kind of metal laser melting increasing material manufacturing method
WO2019136731A1 (en) * 2018-01-15 2019-07-18 大连理工大学 Manufacturing method for microstructure
CN108941558A (en) * 2018-07-25 2018-12-07 广东大族粤铭激光集团股份有限公司 Deng increase and decrease material composite forming apparatus and its processing method
CN108941557B (en) * 2018-07-25 2020-10-16 广东大族粤铭激光集团股份有限公司 Additive material composite forming equipment and forming method thereof
CN108941557A (en) * 2018-07-25 2018-12-07 广东大族粤铭激光集团股份有限公司 Materials composite forming apparatus and its manufacturing process such as increasing
CN109317672A (en) * 2018-10-16 2019-02-12 北京星航机电装备有限公司 A kind of increase and decrease material composite manufacturing and online dimension detection device based on powder bed melting increases material manufacturing technology
CN109175367A (en) * 2018-10-25 2019-01-11 武汉钢铁有限公司 Increase material, etc. materials composition metal 3D laser forming device and its method
CN109530689A (en) * 2018-11-26 2019-03-29 西安增材制造国家研究院有限公司 Reinforcing elements, increasing material processing unit (plant) and processing method with online strengthening effect
CN109746443A (en) * 2018-12-29 2019-05-14 华中科技大学 A kind of method of parallel control part deformation and precision during increasing material manufacturing
RU2745219C1 (en) * 2018-12-29 2021-03-22 Хуачжун Юниверсити Оф Сайенс Энд Текнолоджи Method for parallel control of deformation and accuracy of parts manufacturing during additive manufacturing process
CN110052713A (en) * 2019-03-22 2019-07-26 江南大学 Part increases and decreases material composite manufacturing technology
CN110052713B (en) * 2019-03-22 2020-04-10 江南大学 Composite manufacturing process for increasing and decreasing materials of parts

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Application publication date: 20160316

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