CN117102508B - Laser selective melting defect regulation and control device and method - Google Patents
Laser selective melting defect regulation and control device and method Download PDFInfo
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- CN117102508B CN117102508B CN202311101197.3A CN202311101197A CN117102508B CN 117102508 B CN117102508 B CN 117102508B CN 202311101197 A CN202311101197 A CN 202311101197A CN 117102508 B CN117102508 B CN 117102508B
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- 230000007547 defect Effects 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000002844 melting Methods 0.000 title claims abstract description 47
- 230000008018 melting Effects 0.000 title claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 84
- 230000001276 controlling effect Effects 0.000 claims abstract description 32
- 238000007639 printing Methods 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 17
- 230000010354 integration Effects 0.000 claims description 12
- 230000003068 static effect Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 27
- 239000010410 layer Substances 0.000 description 19
- 238000002591 computed tomography Methods 0.000 description 16
- 239000000843 powder Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 230000035882 stress Effects 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 230000007480 spreading Effects 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000013173 literature analysis Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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
- B22F10/80—Data acquisition or data processing
- B22F10/85—Data acquisition or data processing for controlling or regulating additive manufacturing processes
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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
- B22F10/20—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
- 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
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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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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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
- 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
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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
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- Materials Engineering (AREA)
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Abstract
The invention discloses a device and a method for regulating and controlling a laser selective melting defect, which belong to the technical field of laser selective melting and comprise the following steps: performing laser selective melt printing on the substrate based on the set parameters; performing searchlighting on the printed part through industrial CT to obtain the shape and the space position of the internal defect of the part; carrying out ultrasonic rolling treatment on the printed part according to the shape and the space position of the defect, obtaining the treated part and continuing printing; and carrying out searchlighting on the parts which are continuously printed through the industrial CT, checking whether the parts which are continuously printed have defects, adjusting ultrasonic rolling parameters to carry out ultrasonic rolling treatment again when the defects exist, and continuously printing until the printing is completed when the defects do not exist. The method can monitor the SLM process in real time, match corresponding ultrasonic rolling process parameters according to the position and the size of the defect, realize real-time accurate regulation and control in the forming process, and improve the overall performance of the SLM forming component.
Description
Technical Field
The invention belongs to the technical field of selective laser melting, and particularly relates to a selective laser melting defect regulating and controlling device and method.
Background
The laser selective melting (SELECTIVE LASER MELTING, SLM) technology is one of the most active and promising research directions in the field of additive manufacturing due to the characteristics of high precision, high degree of freedom, low cost, short period and the like. The technical principle is that the high-energy laser beam melts and solidifies the metal powder layer by layer rapidly, and the rapid prototype manufacturing is realized by a discrete-stacking mode, which has outstanding advantages in the manufacturing of complex parts. However, due to the high heat gradient and high cooling rate caused by SLM, defects such as air holes, cracks and the like often exist in the formed member, which affect the mechanical properties of the member.
In order to solve the defect problem in the SLM, domestic and foreign scholars explore the technological method of improving the quality of a formed component by combining the SLM with surface deformation strengthening, such as mechanical shot blasting (SP), ultrasonic impact (UP), ultrasonic Surface Rolling (USR) and the like. The quality and efficiency of the sample prepared by the SLM processed by the USR are better than those of other surface modification technologies, and the advantages of simplicity in operation, lower cost, good practical effect and the like are utilized, so that the method has the most advantages in the surface plastic deformation modification method, but the USR is mainly applied to improving the integrity of the surface of a component at present, and internal tissues and stress defects formed in the technical process of the SLM are difficult to eliminate. Therefore, it is necessary to further optimize the process of combining SLM with USR, regulate the internal defects of the formed member, and improve the forming quality.
The prior art discloses a quality monitoring and controlling method for selective laser melting, which comprises the following steps: 1) After the single-layer powder paving operation is completed, carrying out image acquisition on a powder paving area to obtain a powder paving image; 2) Analyzing the obtained powder spreading image to obtain a powder spreading image, and regulating and controlling the non-uniform powder spreading area in the range; 3) Acquiring acoustic emission signals in the process of scanning the powder by laser to acquire defect positions; 4) After the laser scanning operation is completed, image acquisition is carried out on a scanning area, and scanning defect positions determined through the image acquisition are obtained; 5) And comparing the generated emission signals with the defect positions determined by image acquisition, and performing corresponding regulation and control. However, the method only prevents the formation of defects by improving the powder paving quality, and cannot effectively cope with the defects such as air holes, cracks and the like caused by gas overflow and thermal stress in the SLM process, and has limitation in practical application.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for regulating and controlling the melting defect of a laser selective area, which are used for solving the problems in the prior art.
In order to achieve the above purpose, the invention provides a method for regulating and controlling the melting defect of a laser selective area, which comprises the following steps:
performing laser selective melt printing on the substrate based on the set parameters;
performing searchlighting on the printed part through industrial CT to obtain the shape and the space position of the internal defect of the part;
carrying out ultrasonic rolling treatment on the printed part according to the shape and the space position of the defect, obtaining the treated part and continuing printing;
and carrying out searchlighting on the parts which are continuously printed through the industrial CT, checking whether the parts which are continuously printed have defects, adjusting ultrasonic rolling parameters to carry out ultrasonic rolling treatment again when the defects exist, and continuously printing until the printing is completed when the defects do not exist.
Preferably, the method for performing ultrasonic rolling treatment comprises the following steps: establishing a coordinate system, analyzing the obtained defect morphology and position, and recording the initial and termination coordinates of projection of the defect morphology and position in the axial direction of the coordinate system X, Y, Z; the image processing industrial personal computer determines the size of a region to be processed according to start-stop coordinates of the defect in the X, Y axial direction, plans a path according to the size of the region, and simultaneously matches rolling parameters according to the maximum depth value of the defect and the defect length; and performing ultrasonic rolling treatment according to the planned path and rolling parameters.
Preferably, the ultrasonic rolling parameters include ultrasonic frequency and static pressure.
Preferably, the feeding direction of the ultrasonic rolling is consistent with the laser scanning forming path.
The invention also provides a device for regulating and controlling the melting defect of the laser selective area, which comprises the following components:
the laser selective melting equipment is used for performing laser selective melting printing;
the industrial CT is connected with the laser selective melting equipment and is used for probing the printed parts to obtain a probing result;
The ultrasonic rolling integrated module is used for carrying out ultrasonic rolling on the printed part;
And the control system is respectively connected with the industrial CT and the ultrasonic rolling integrated device, and is used for matching ultrasonic frequency and static pressure according to a searchlighting result and controlling the ultrasonic rolling integrated device to carry out ultrasonic rolling.
Preferably, the laser selective melting device comprises a laser, a laser galvanometer, a forming cylinder and a forming cavity which are connected in sequence.
Preferably, the ultrasonic rolling integration module comprises a mechanical arm, an ultrasonic rolling integration device and an ultrasonic generator;
The ultrasonic rolling integrated device is connected with the laser selective melting equipment through a mechanical arm and is used for carrying out ultrasonic rolling on the printed part;
the mechanical arm is used for assisting the ultrasonic rolling integrated device to move;
The ultrasonic generator is connected with the ultrasonic rolling integration device and is used for providing ultrasonic waves for the ultrasonic rolling integration device.
Preferably, the control system comprises an image processing industrial personal computer and a display;
The image processing industrial personal computer is used for matching ultrasonic frequency and static pressure according to the detection result and controlling the ultrasonic rolling integrated device to carry out ultrasonic rolling;
The display is used for displaying the searchlighting result and the ultrasonic rolling parameters.
Compared with the prior art, the invention has the following advantages and technical effects:
The device and the method for regulating and controlling the selective melting defect of the laser can monitor the technical process of the SLM in real time, match corresponding ultrasonic rolling technical parameters according to the position and the size of the defect, realize real-time accurate regulation and control in the forming process, and effectively improve the overall performance of the SLM forming component.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a flow chart of a method for controlling a laser selective melting defect according to an embodiment of the present invention;
FIG. 2 is a diagram showing a structure of a laser selective melting defect control apparatus according to an embodiment of the present invention;
FIG. 3 is a graph of tensile strength versus formed member of an embodiment of the present invention;
FIG. 4 is a graph of elongation versus forming member according to an embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Example 1
As shown in fig. 1, the invention provides a method for regulating and controlling a melting defect of a laser selective area, which comprises the following steps:
performing a laser selective melting printing process, and printing solid parts on the substrate according to set parameters;
after finishing printing N layers, suspending the printing process, and performing searchlighting on the printed and formed front N layers by using industrial CT to obtain the shape and the spatial position of the internal defect of the sample;
Analyzing the obtained defect morphology and position, recording the initial and final coordinates projected in the X, Y, Z direction, and respectively recording as x 0,x1,y0,y1 and z 0,z1; the image processing industrial personal computer determines the size of a region to be processed according to start-stop coordinates of the defect in the X, Y direction, plans a path according to the size of the region, and simultaneously matches rolling parameters such as ultrasonic frequency, static pressure and the like according to the maximum depth value z 1 of the defect and the defect length (z 1-z0); after the path and the parameters are determined, ultrasonic rolling treatment is carried out, and the whole process is generally called first detection and regulation;
After the first detection and regulation are all completed, aiming at the limitation that the ultrasonic rolling regulation effect is reduced along with the increase of depth, carrying out industrial CT (computed tomography) searchlight on the printed and formed front N+n layer, and detecting whether an untreated complete area and a defect newly formed at an interlayer bonding surface exist or not; ; if the defects exist, matching the technological parameters required by the second regulation and control according to the size and the position of the defects, properly increasing the rolling static pressure, and circulating until all the defects are completely eliminated, and realizing closed-loop control of defect monitoring and regulation and control in the laser selective melting process through the circulating feedback mechanism;
And continuing the printing process, carrying out monitoring and regulating operation every time N layers are printed, and ending the printing process after all the solid parts are printed.
Further, along with the increase of depth, the effect of ultrasonic rolling is gradually reduced, and cracks are easy to initiate at the interlayer bonding surface, so that the front N+n layer is subjected to defect monitoring and regulation again, and the real-time monitoring and accurate regulation of defects are ensured.
Further, from the second time, the static pressure F=k 0 (a-1)F0 required by the regulation and control of the a-th ultrasonic rolling is carried out, wherein the proportionality coefficient k 0 is a constant, and the value range is 1.0-1.1; the selection of the proportionality coefficient is optimized and adjusted according to specific materials and technological parameters;
Further, based on the demonstration data and the existing literature analysis, the value of N is between 10 and 50, the value of N is between 3 and 10, and the values of N and N are positive integers.
Further, the length X and the width Y of the region to be rolled are calculated by the first proportionality coefficient k 1 and the second proportionality coefficient k 2 and the corresponding coordinate differences (X 1-x0) and (Y 1-y0), respectively, the surface area S of the region to be regulated and controlled can be represented as s=k 1k2(x1-x0)(y1-y0), wherein k 1 and k 2 are constants, and the value range is 1.1-1.2; the scaling factor should be selected and adjusted according to the specific materials and process parameters.
Further, the ultrasonic rolling feeding direction is consistent with a laser scanning forming path in the SLM process until the area to be processed is completely covered, then the rolling head moves to the next area to be processed, and ultrasonic rolling treatment is sequentially carried out on the defects between layers.
Further, the ultrasonic rolling parameters are rolling speed of 20-100 mm/min, static pressure of 500-1500N, and the processing time and energy consumption should be minimized as much as possible under the premise of ensuring the regulation and control effect.
Further, the ultrasonic amplitude is matched according to the longitudinal termination coordinate z 1 of the defect, wherein the ultrasonic frequency is f=f 0+k3z1, f 0 is the initial ultrasonic frequency, and k 3 is the third scaling factor.
As shown in fig. 2, the invention provides a laser selective melting defect regulating device, wherein an industrial CT3, an ultrasonic rolling integrated device and a control system 11 are installed in a forming cavity 7 in laser selective melting equipment; the industrial CT is used for detecting internal defects in the forming layer; the ultrasonic rolling integration device 6 is used for generating ultrasonic vibration rolling force; the control system 11 matches the path and process parameters of the superroll based on the location and size of the internal defects.
Further, the laser selective melting device comprises a laser 1, a laser vibrating mirror 2, an industrial CT3, a mechanical arm 4, an ultrasonic rolling integration device 6, an ultrasonic generator 5, a forming cylinder 8, an image processing industrial personal computer 9 and a display screen 10, wherein the laser vibrating mirror 2 is positioned above the forming cavity 7, and the image processing industrial personal computer 9 is connected with the industrial CT3, the mechanical arm 4 and the ultrasonic generator 5 and used for controlling the automation operation of the whole system.
Example two
As shown in fig. 1, the method for regulating and controlling the melting defects of the selective laser melting process of the invention detects defects of the forming layer through industrial CT, determines the positions of the defects, plans an ultrasonic rolling regulating and controlling path according to the position information, and matches ultrasonic rolling parameters according to the depth of the defects so as to realize real-time and accurate control of the quality of the forming component in the SLM process. The method comprises the following steps:
1) Slicing the three-dimensional model of the part, setting printing parameters, paving metal powder, introducing argon until the oxygen content is reduced to 550ppm, and starting a laser for printing.
2) Every time N layers of industrial CT are printed, the formed front N layers are monitored, the internal defect distribution condition of the formed layers is detected, and position information is recorded as start-stop coordinates in the X, Y, Z direction, which are respectively x 0,x1,y0,y1 and z 0,z1.
3) The size of the region to be regulated is S=k 1k2(x1-x0)(y1-y0), wherein k 1、k2 is a proportionality coefficient, the value range is 1.1-1.2, and optimization and adjustment are carried out according to specific materials and process parameters; matching ultrasonic frequency f according to the maximum value z 1 of the defect depth, wherein the ultrasonic frequency is f=f 0+k3z1, and the ultrasonic frequency is used for eliminating residual tensile stress between formed component layers and introducing residual compressive stress; wherein f 0 is the initial ultrasonic frequency of 30kHz, and k 3 is the third proportionality coefficient of 0.07 kHz/. Mu.m; the ultrasonic rolling parameters are rolling speed of 20-100 mm/min, static pressure of 500-1500N, and the processing time and energy consumption should be minimized as much as possible under the premise of guaranteeing the regulation and control effect.
4) After the regulation is finished, carrying out industrial CT (computed tomography) searchlight on the front N+n layer again, and detecting whether the defects of untreated completion or new formation of an interlayer bonding surface exist; if so, corresponding regulation and control are continued, and circulation is carried out until all defects are completely eliminated.
5) Repeating the steps 2 to 4 until the component is printed, turning off the laser, and taking out the component after cooling.
The laser selective melting method for accurately controlling defects in real time aims at the defect problems caused by high heat gradient and high cooling rate in the SLM process, adopts interlayer ultrasonic rolling treatment, eliminates metallurgical micropores between layers by using USR-induced compressive stress and strain distribution, and converts columnar crystals formed in a free increment mode into equiaxed fine crystals, thereby improving the forming quality and the uniformity and stability of tissues, and realizing the high-performance manufacturing of SLM forming components.
As shown in fig. 2, the laser selective melting defect regulating device is provided with an industrial CT3, a mechanical arm 4, an ultrasonic generator 5 and an ultrasonic rolling integration device 6 in a forming cavity 7 of SLM equipment; the ultrasonic rolling integration device 6 is arranged on the mechanical arm 4, the control system 11 comprises an image processing industrial personal computer 9 and a display 10, and is connected with the mechanical arm 4 and the ultrasonic generator 5 to control ultrasonic rolling treatment in a specific interlayer area; the laser 1 and the vibrating mirror 2 are positioned above the forming cavity 7, and the powder cylinder, the forming cylinder 8 and the recovery cylinder are positioned below the forming cavity 7.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The method comprises the steps of carrying out three-dimensional modeling and slicing on a part to be processed, setting processing parameters to be 150W of laser power, 100mm/s of scanning speed, 40 μm of layer thickness and 100 μm of scanning interval. And (3) introducing argon after the metal powder is paved, starting a laser device until the oxygen content is lower than 550ppm, and starting an SLM printing process.
In the printing process, N layers are printed, the internal defect condition of the front N layers is monitored in real time through industrial CT, the internal defect state is visually displayed by a display, and the start-stop coordinates of the defects are analyzed by an image processing industrial personal computer. When the coordinate difference values of the defects in the X, Y, Z direction are (x 1-x0)(y1-y0)(z1-z0) respectively, planning a region S=k 1k2(x1-x0)(y1-y0),k1k2 to be regulated according to the size of the defects, and taking 1.15; taking 0.07kHz/μm according to the defect depth matching ultrasonic frequency f=f 0+k3z1,f0＝3kHz,k3; static pressure is 600N, and rolling speed is 40mm/min.
The tensile strength of the formed sample is shown in fig. 3, and the tensile strength of the laser selective melting sample for accurately controlling defects in real time is 310.1Mpa, which is obviously improved compared with the prior art and surface ultrasonic rolling. The elongation of the sample of the example is 8.41%, which is improved by 108.68% and 64.9% respectively compared with the prior art and surface ultrasonic rolling, and the mechanical property of the formed sample is remarkably improved, and the elongation comparison chart is shown in fig. 4.
In summary, the significant advantages of the present invention over the prior art are summarized as follows:
1. The laser selective melting method for accurately regulating and controlling the defects in real time aims at the problem that the defects are easy to cause due to high heat gradient and high cooling rate in the SLM process, monitors the process in real time, matches corresponding ultrasonic rolling process parameters according to the position and the size of the defects, realizes the accurate regulation and control in real time in the forming process, and effectively improves the overall performance of the SLM forming member.
2. The laser selective melting method for accurately regulating and controlling defects in real time can refine grains and improve the surface hardness of materials by utilizing the plastic flow effect of ultrasonic rolling, simultaneously, greatly eliminate the residual tensile stress on the surfaces of the materials and introduce the residual compressive stress, eliminate the metallurgical defects in the SLM process and improve the interface bonding strength.
3. The laser selective melting device for accurately regulating and controlling the defects in real time comprehensively utilizes the advantages of non-contact measurement means such as industrial CT, an image processing industrial personal computer and the like, realizes the positioning and accurate regulation and control of the internal defects in the forming process on the basis of not damaging forming components, and has higher practicability.
4. The laser selective melting device for accurately regulating and controlling the defects in real time comprises a laser selective melting device, an industrial CT (computed tomography), an image processing control system and an ultrasonic rolling device, wherein parameters are displayed and automatically controlled by the image processing control system, so that time and economic loss caused by repeated rolling processes are avoided, and the accuracy and efficiency of the defect regulating and controlling processes are improved.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (7)
1. The method for regulating and controlling the melting defect of the laser selective area is characterized by comprising the following steps of:
performing laser selective melt printing on the substrate based on the set parameters;
performing searchlighting on the printed part through industrial CT to obtain the shape and the space position of the internal defect of the part;
carrying out ultrasonic rolling treatment on the printed part according to the shape and the space position of the defect, obtaining the treated part and continuing printing;
performing searchlighting on the part obtained by continuing to print through industrial CT, checking whether the part obtained by continuing to print has defects, adjusting ultrasonic rolling parameters to perform ultrasonic rolling treatment again when the part has the defects, and continuing to print until printing is completed when the part does not have the defects;
The ultrasonic rolling treatment method comprises the following steps:
establishing a coordinate system, analyzing the obtained defect morphology and position, and recording the initial and termination coordinates of projection of the defect morphology and position in the axial direction of the coordinate system X, Y, Z; the image processing industrial personal computer determines the size of a region to be processed according to start-stop coordinates of the defect in the X, Y axial direction, plans a path according to the size of the region, and simultaneously matches ultrasonic rolling parameters according to the maximum depth value of the defect and the defect length; and performing ultrasonic rolling treatment according to the planned path and rolling parameters.
2. The method for controlling a laser selective melting defect according to claim 1, wherein,
The ultrasonic rolling parameters comprise ultrasonic frequency and static pressure.
3. The method for controlling a laser selective melting defect according to claim 1, wherein,
The feeding direction of the ultrasonic rolling is consistent with the laser scanning forming path.
4. A laser selective area melting defect controlling apparatus for carrying out the laser selective area melting defect controlling method according to any one of claims 1 to 3, characterized by comprising:
the laser selective melting equipment is used for performing laser selective melting printing;
the industrial CT is connected with the laser selective melting equipment and is used for probing the printed parts to obtain a probing result;
The ultrasonic rolling integrated module is used for carrying out ultrasonic rolling on the printed part;
And the control system is respectively connected with the industrial CT and the ultrasonic rolling integrated module, and is used for matching ultrasonic frequency and static pressure according to a searchlighting result and controlling the ultrasonic rolling integrated module to carry out ultrasonic rolling.
5. The apparatus for controlling a laser selective melting defect according to claim 4, wherein,
The laser selective melting equipment comprises a laser, a laser vibrating mirror, a forming cylinder and a forming cavity which are sequentially connected.
6. The apparatus for controlling a laser selective melting defect according to claim 4, wherein,
The ultrasonic rolling integration module comprises a mechanical arm, an ultrasonic rolling integration device and an ultrasonic generator;
The ultrasonic rolling integrated device is connected with the laser selective melting equipment through a mechanical arm and is used for carrying out ultrasonic rolling on the printed part;
the mechanical arm is used for assisting the ultrasonic rolling integrated device to move;
The ultrasonic generator is connected with the ultrasonic rolling integration device and is used for providing ultrasonic waves for the ultrasonic rolling integration device.
7. The apparatus for controlling a laser selective melting defect according to claim 4, wherein,
The control system comprises an image processing industrial personal computer and a display;
The image processing industrial personal computer is used for matching ultrasonic frequency and static pressure according to the detection result and controlling the ultrasonic rolling integrated device to carry out ultrasonic rolling;
The display is used for displaying the searchlighting result and the ultrasonic rolling parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311101197.3A CN117102508B (en) | 2023-08-30 | 2023-08-30 | Laser selective melting defect regulation and control device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311101197.3A CN117102508B (en) | 2023-08-30 | 2023-08-30 | Laser selective melting defect regulation and control device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117102508A CN117102508A (en) | 2023-11-24 |
| CN117102508B true CN117102508B (en) | 2024-05-14 |
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| CN108176857A (en) * | 2018-03-05 | 2018-06-19 | 广东工业大学 | A kind of metal 3D printing composite manufacturing method and its device |
| CN111207986A (en) * | 2020-04-22 | 2020-05-29 | 中国航发上海商用航空发动机制造有限责任公司 | Non-destructive testing method for non-fusion defect, testing standard part and manufacturing method thereof |
| CN112508841A (en) * | 2020-09-09 | 2021-03-16 | 中国兵器科学研究院宁波分院 | Dot matrix hollowed-out structure size deviation rapid characterization method based on industrial CT image |
| CN116117163A (en) * | 2023-02-22 | 2023-05-16 | 江苏海洋大学 | Method for regulating alloy grain boundary structure by ultrasonic micro-forging auxiliary laser selective melting |
| CN116117170A (en) * | 2022-11-10 | 2023-05-16 | 江苏大学 | Real-time step-by-step regulation and control system and method for additive manufacturing of aluminum-lithium alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108176857A (en) * | 2018-03-05 | 2018-06-19 | 广东工业大学 | A kind of metal 3D printing composite manufacturing method and its device |
| CN111207986A (en) * | 2020-04-22 | 2020-05-29 | 中国航发上海商用航空发动机制造有限责任公司 | Non-destructive testing method for non-fusion defect, testing standard part and manufacturing method thereof |
| CN112508841A (en) * | 2020-09-09 | 2021-03-16 | 中国兵器科学研究院宁波分院 | Dot matrix hollowed-out structure size deviation rapid characterization method based on industrial CT image |
| CN116117170A (en) * | 2022-11-10 | 2023-05-16 | 江苏大学 | Real-time step-by-step regulation and control system and method for additive manufacturing of aluminum-lithium alloy |
| CN116117163A (en) * | 2023-02-22 | 2023-05-16 | 江苏海洋大学 | Method for regulating alloy grain boundary structure by ultrasonic micro-forging auxiliary laser selective melting |
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