CN106180707A - A kind of adjustment according to part real-time temperature field prints tactful method - Google Patents

A kind of adjustment according to part real-time temperature field prints tactful method Download PDF

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Publication number
CN106180707A
CN106180707A CN201610512940.8A CN201610512940A CN106180707A CN 106180707 A CN106180707 A CN 106180707A CN 201610512940 A CN201610512940 A CN 201610512940A CN 106180707 A CN106180707 A CN 106180707A
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subregion
current layer
forming platform
part current
field
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CN201610512940.8A
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CN106180707B (en
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杨东辉
李洋
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Xian Bright Laser Technologies Co Ltd
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Xian Bright Laser Technologies Co Ltd
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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
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/25—Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS]
    • 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
    • B22F10/36—Process control of energy beam parameters
    • B22F10/368—Temperature or temperature gradient, e.g. temperature of the melt pool
    • 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
    • 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
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • 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
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/70—Gas flow means
    • 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
    • B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
    • B22F12/90—Means for process control, e.g. cameras or sensors
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Radiation Pyrometers (AREA)

Abstract

The invention discloses a kind of method adjusting according to part real-time temperature field and printing strategy, read, by computer, each subregion page order the record that part current layer is preset；Obtain forming platform Current Temperatures field；According to the forming platform Current Temperatures field obtained, calculate the average temperature value of each subregion of part current layer, and according to this average temperature value, each for part current layer subregion is ranked up from small to large according to temperature；The each subregion page order preset with part current layer that sorted by each subregion of part current layer of acquisition compares, if unanimously, then continues to print according to default each subregion page order；Otherwise, control equipment carries out the printing of part current layer according to part current layer each subregion sequence that step 3 obtains.The inventive method utilize infrared thermography to monitor part forming in real time during temperature field, and adjust printing strategy in time according to the Temperature Distribution of current part, reduce the problem produced because of thermal stress in the part course of processing, improve part crudy.

Description

A kind of adjustment according to part real-time temperature field prints tactful method
Technical field
The invention belongs to SLM forming technique field, be specifically related to a kind of adjustment according to part real-time temperature field and print strategy Method.
Background technology
Owing to, in SLM forming process, it is uneven that the laser energy of instantaneous concentration easily causes Part temperature field distribution, makes Part local stress in forming process increases, and produces the defects such as buckling deformation even cracking.
How to analyze SLM forming process from thermodynamics is a direction being worth research.At present, some research worker Utilize finite element method emulation to obtain forming process temperature and the distribution situation of stress field, and on affect forming temperature, The parameter of stress has carried out correlational study.But the SLM device that can monitor temperature field in real time is few.Thermal infrared imager Utilizing Infrared Detectors and optical imagery object lens to receive the infrared energy distribution pattern of measured target, then reflection is to infrared On the light-sensitive element of detector, thus obtaining Infrared Thermogram, this thermography is corresponding with the heat distribution field of body surface.By Measured target this advantage of bulk temperature distribution situation can be visually observed that in it, there is the scope that is extremely widely applied. But also there is not SLM device to apply this technology at present.
Generally, when utilizing SLM technology processing part, need part is carried out subdivision.Relevant subdivision ginseng can be set before subdivision Number, selection print strategy, change scanning speed etc., after setting, i.e. cannot change during part forming.But actual processing Process is because the impact of the factors such as technological parameter, support strength, external environment condition is often the most extremely complex and is difficult to control completely. If able to adjust printing strategy in time according to actual forming process, the generation of a lot of problem can be avoided, and part forming mistake Temperature field in journey is the content wherein needing key monitoring.
Part thermal stress is excessive is susceptible to deformation, cracking.Existing SLM device the most all cannot be to the part course of processing In temperature field monitor in real time.Even if some SLM device can realize obtaining the function of temperature, also tend to there is thermometric not The problems such as standard, error are bigger.
When part is carried out subdivision, need to arrange the printing strategy of part, in the existing course of processing, print strategy logical It is often fixing, will not change.Owing to prior art can not adjust printing plan in time according to the actual forming process of part Slightly, this increases the percent defective of part virtually.
Summary of the invention
It is an object of the invention to provide a kind of method adjusting according to part real-time temperature field and printing strategy, solve existing Manufacturing process cannot obtain accurate temperature field and adjust the problem printing strategy according to temperature field.
The technical solution adopted in the present invention is, a kind of method printing strategy that adjusts according to part real-time temperature field, bag Include following steps:
Step 1, reads, by computer, each subregion page order the record that part current layer is preset；
Step 2, obtains forming platform Current Temperatures field；
Step 3, the forming platform Current Temperatures field obtained according to step 2, calculate the average temperature of each subregion of part current layer Angle value, and according to this average temperature value, each for part current layer subregion is ranked up from small to large according to temperature；
Step 4, the part current layer that part current layer each subregion step 3 obtained sequence and step 1 read is preset Each subregion page order compares, if unanimously, then continues to print according to default each subregion page order；Otherwise, control to set The standby part current layer each subregion sequence obtained according to step 3 carries out the printing of part current layer.
The feature of the present invention also resides in:
In step 2, forming platform Current Temperatures field utilizes infrared thermography measurement to obtain.
In step 3, the mean temperature value-acquiring method of each subregion of part current layer is:
(1) according to the zoning ordinance of part current layer, forming platform is divided into corresponding many with part current layer subregion Individual subregion；
(2) the forming platform Current Temperatures field obtained according to infrared thermography, extracts forming platform each zone temperature field Distribution, and calculate forming platform each subregion average temperature value T；Meanwhile, forming platform each Division area value S and corresponding is obtained Part current layer each Division area value S ＇, calculated by formula (1), it is thus achieved that part current layer each subregion average temperature value T ＇,
In step 1, subregion is band subregion or chessboard subregion.
Infrared thermography is arranged in the shaping cabin of SLM device.
The invention has the beneficial effects as follows, during the inventive method utilizes infrared thermography to monitor part forming in real time Temperature field, and adjust printing strategy in time according to the Temperature Distribution of current part, reduce in the part course of processing because thermal stress is produced Raw problem, improves part crudy.
Accompanying drawing explanation
Fig. 1 is the SLM device structural representation that the inventive method is used；
Fig. 2 is that the present invention adjusts the method flow diagram printing strategy according to part real-time temperature field；
Fig. 3 is two kinds of subregion schematic diagrams of part；
Fig. 4 is forming platform band subregion schematic diagram of the present invention；
Fig. 5 is forming platform chessboard subregion schematic diagram of the present invention；
In Fig. 1,1. laser instrument, 2. protective glass, 3. air inlet, 4. shape cabin, 5. receive powder cabin, 6. piston, 7. substrate, 8. become Shape part, 9. powder feeding cabin, 10. scraper, 11. air outlets, 12. computers, 13. infrared thermographies, 14. laser beams.
Detailed description of the invention
The present invention is described in further detail with detailed description of the invention below in conjunction with the accompanying drawings, but the present invention is not limited to These embodiments.
The present invention adjusts the equipment printing tactful method employing as shown in Figure 1, in figure according to part real-time temperature field Contain the basic building block of SLM device, laser instrument 1, protective glass 2, air inlet 3, shape cabin 4, receive powder cabin 5, piston 6, substrate 7, Powder feeding cabin 9, scraper 10, air outlet 11, laser beam 14.For the method realizing the present invention, pacify in the shaping cabin 4 of SLM device Dress infrared thermography 13, and SLM device, infrared thermography 13 are all connected with computer 12.
The inventive method, with reference to Fig. 2, is specifically implemented according to following steps:
Step 1, reads each subregion page order that part current layer is preset.
Before part forming, subdivision software can carry out hierarchy slicing to part, the three-dimensional data information that part is overall is turned Turn to the 2-D data information of each layer, and part every layer section is divided into multiple strip-type subregion or multiple checkerboard type subregion (as shown in Figure 3), preset the page order of the part each subregion of every layer cross section (band subregion or chessboard subregion) simultaneously.By calculating Machine-readable take part current layer preset each subregion page order and record.
Step 2, obtains forming platform Current Temperatures field by infrared thermography.
Step 3, the forming platform Current Temperatures field obtained according to step 2, calculate the average temperature of each subregion of part current layer Angle value, and according to this average temperature value, each for part current layer subregion is ranked up from small to large according to temperature.
The temperature field that temperature field is whole forming platform obtained due to infrared thermography, it is difficult to distinguish forming platform In part section subregion, particularly, when part section profile is irregular, be difficult to obtain part section subregion temperature.Cause This, is in order to obtain the average temperature value of each subregion of part current layer, a kind of method that the invention provides simple possible, the most such as Under:
As shown in Figure 4,5, according to the zoning ordinance of part current layer, forming platform is divided into and part current layer subregion Corresponding multiple subregions.Then the forming platform Current Temperatures field obtained according to infrared thermography, extracts each point of forming platform District's thermo parameters method, and calculate forming platform each subregion average temperature value T；Meanwhile, obtain forming platform each Division area value S and Corresponding part current layer each Division area value S ＇, is calculated by formula (1), it is thus achieved that each subregion of part current layer is average Temperature value T ＇.
Owing to forming platform is regular, its subregion is also regular, therefore, it is very easy to extract its each zone temperature field, Calculating its average temperature value T, the S ＇ of forming platform each Division area value S and each Division area of part current layer can be from subdivision software Middle acquisition, therefore, can be readily available the average temperature value T ＇ of each subregion of part current layer by formula (1).
Step 4, the part current layer that part current layer each subregion step 3 obtained sequence and step 1 read is preset Each subregion page order compares, if unanimously, then continues to print according to default each subregion page order；Otherwise, control to set The standby part current layer each subregion sequence obtained according to step 3 carries out the printing of part current layer.
The region that so preferential print temperature is low, the region that temperature can be allowed high has the longer time to dispel the heat, helps In reducing parts locally temperature, equalization temperature field, prevent temperature inequality from producing stress and concentrate, and cause part to be damaged.
Embodiment
Use SLM former as shown in Figure 1 to carry out part forming, using part section shown in Fig. 4 as current layer be Example, is further elaborated the inventive method.Wherein, square frame show forming platform, and border circular areas is part current layer region, Part current layer region is divided into 7 band subregions.Concrete printing Developing Tactics step is as follows:
Step 1, reads each subregion page order that part current layer is preset: 7-6-5-4-2-3-1 by computer.
Step 2, obtains forming platform Current Temperatures field by infrared thermography.
Step 3, the forming platform Current Temperatures field obtained according to step 2, calculate the average temperature of each subregion of part current layer Angle value, as shown in Figure 4, according to the zoning ordinance of part current layer, is divided into corresponding with part current layer subregion by forming platform Multiple subregions.Then the forming platform Current Temperatures field obtained according to infrared thermography, extracts forming platform each subregion temperature Degree field distribution, and calculate forming platform each subregion average temperature value T；Meanwhile, obtain forming platform each Division area value S and and its Corresponding part current layer each Division area value S ＇, is calculated by formula (1), it is thus achieved that part current layer each subregion mean temperature Value T ＇.
Afterwards, according to this average temperature value, each for part current layer subregion is ranked up from small to large according to temperature, sequence For: 5-6-7-4-3-1-2.
Step 4, each subregion of part current layer step 3 obtained sorts: 5-6-7-4-3-1-2 and the zero of step 1 reading Each subregion page order that part current layer is preset: 7-6-5-4-2-3-1 compares, owing to both sort inconsistent, therefore controls Part current layer each subregion sequence that equipment obtains according to step 3: 5-6-7-4-3-1-2 carries out the printing of part current layer.
Pass through above method, it is achieved that the thermal imaging system monitoring to the forming process temperature field of part, and according to part temperature Degree field distribution adjusts printing strategy in time, reduces the thermal stress produced in the part course of processing, prevents part generation stress from concentrating, Avoid part breaking, damage etc..
Above description of the present invention is section Example, but the invention is not limited in above-mentioned detailed description of the invention. Above-mentioned detailed description of the invention is schematic, is not restrictive.The method of every employing present invention, without departing from this In the case of bright objective and scope of the claimed protection, within all concrete expansions all belong to protection scope of the present invention.

Claims (5)

1. one kind adjusts the method printing strategy according to part real-time temperature field, it is characterised in that comprise the following steps:
Step 1, reads, by computer, each subregion page order the record that part current layer is preset；
Step 2, obtains forming platform Current Temperatures field；
Step 3, the forming platform Current Temperatures field obtained according to step 2, calculate the average temperature value of each subregion of part current layer, And according to this average temperature value, each for part current layer subregion is ranked up from small to large according to temperature；
Step 4, default each point of part current layer that part current layer each subregion step 3 obtained sequence is read with step 1 District's page order compares, if unanimously, then continues to print according to default each subregion page order；Otherwise, control equipment is pressed Part current layer each subregion sequence according to step 3 acquisition carries out the printing of part current layer.
The most according to claim 1 adjustment according to part real-time temperature field prints tactful method, it is characterised in that step The field of forming platform Current Temperatures described in 2 utilizes infrared thermography measurement to obtain.
The most according to claim 1 adjustment according to part real-time temperature field prints tactful method, it is characterised in that step The mean temperature value-acquiring method of each subregion of part current layer described in 3 is:
(1) according to the zoning ordinance of part current layer, forming platform is divided into multiple point corresponding with part current layer subregion District；
(2) the forming platform Current Temperatures field obtained according to infrared thermography, extracts forming platform each zone temperature field distribution, And calculate forming platform each subregion average temperature value T；Meanwhile, forming platform each Division area value S and corresponding zero is obtained Part current layer each Division area value S ＇, is calculated by formula (1), it is thus achieved that part current layer each subregion average temperature value T ＇,
The most according to claim 1 adjustment according to part real-time temperature field prints tactful method, it is characterised in that step Subregion described in 1 is band subregion or chessboard subregion.
The most according to claim 2 adjustment according to part real-time temperature field prints tactful method, it is characterised in that described Infrared thermography is arranged in the shaping cabin of SLM device.
CN201610512940.8A 2016-07-01 2016-07-01 A kind of method that printing strategy is adjusted according to part real-time temperature field Active CN106180707B (en)

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Cited By (8)

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CN106682299A (en) * 2016-12-22 2017-05-17 西安交通大学 Design and manufacturing method used for selective laser sintering sand mould regional strength change
CN107159889A (en) * 2017-06-28 2017-09-15 南京中科煜宸激光技术有限公司 The measurement of product temperature subregion and control method in laser gain material manufacture
CN108044043A (en) * 2017-12-04 2018-05-18 东方电气集团东方汽轮机有限公司 A kind of control investment pattern precision casting ceramic core/shell Forming Quality stability approach
CN108788153A (en) * 2018-08-27 2018-11-13 西安空天能源动力智能制造研究院有限公司 A kind of melt-processed process real-time quality monitoring device in selective laser and method
CN110125402A (en) * 2019-05-29 2019-08-16 中国航空制造技术研究院 A kind of efficient low stress electron beam fuse deposition formation method
CN110695492A (en) * 2019-09-24 2020-01-17 华中科技大学 Temperature distribution-based complex part partition manufacturing method
CN113000860A (en) * 2021-02-26 2021-06-22 西安理工大学 Scanning point temperature prediction control method in laser additive manufacturing
CN114834046A (en) * 2022-01-21 2022-08-02 深圳市纵维立方科技有限公司 Printing control method and device, readable storage medium and three-dimensional printer

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CN106682299A (en) * 2016-12-22 2017-05-17 西安交通大学 Design and manufacturing method used for selective laser sintering sand mould regional strength change
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CN108788153A (en) * 2018-08-27 2018-11-13 西安空天能源动力智能制造研究院有限公司 A kind of melt-processed process real-time quality monitoring device in selective laser and method
CN110125402A (en) * 2019-05-29 2019-08-16 中国航空制造技术研究院 A kind of efficient low stress electron beam fuse deposition formation method
CN110695492A (en) * 2019-09-24 2020-01-17 华中科技大学 Temperature distribution-based complex part partition manufacturing method
CN110695492B (en) * 2019-09-24 2020-11-24 华中科技大学 Temperature distribution-based complex part partition manufacturing method
CN113000860A (en) * 2021-02-26 2021-06-22 西安理工大学 Scanning point temperature prediction control method in laser additive manufacturing
CN114834046A (en) * 2022-01-21 2022-08-02 深圳市纵维立方科技有限公司 Printing control method and device, readable storage medium and three-dimensional printer

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