Surface quality control device for three-dimensional (3D) part formed through metal drop printing and control method of surface quality control device
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A technology of surface quality and control device, applied in the direction of additive processing, can solve the problems of difficult to meet the technical requirements of parts use, large surface roughness, etc., to reduce interlayer defects and step effects, improve forming quality, reduce fish scales The effect of topography
Active Publication Date: 2015-11-25
XUCHANG UNIV
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[0003] In order to solve the existing problems that the surface of the existing metal droplet deposition parts has regular "fish scale morphology", unevenness, large surface roughness, and it is difficult to meet the technical requirements for the use of parts, the present invention proposes a rapid surface melting method using laser A method for controlling the forming surface of parts by directional scraping and pressing composite treatment of covering and flattening rollers, and providing a device for realizing forming surface control by using this method
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Embodiment 1
[0021] Embodiment 1. Tin alloy droplet printing forming part test
[0022] (1) According to the material properties of the tin alloy droplet, the diameter of the selected deposited droplet is: 200 microns, the thickness of the deposited layer is 150 microns, the selected laser power is 1.5KW, the spot size is 250 microns, and the scanning speed is 5m / s;
[0023] (2) According to the layered data information of the parts, the computer sets the appropriate temperature of the deposition substrate as: 150°C, the injection frequency of metal droplets is 5Hz, the speed of the moving platform is 1mm / s, and deposits a single layer point by point according to the scanning deposition path. level;
[0024] (3) Move the deposited single layer to the laser cladding area, turn on the laser and set the laser power to 1.5KW and the spot size to 250 microns, and set the appropriate roller cladding depth to 50 microns through the roller height adjuster and a pressure of 0.2MP;
[0025] (4)...
Embodiment 2
[0030] Example 2. Test of Aluminum Alloy Droplet Printing and Forming Parts
[0031] (1) According to the material characteristics of the aluminum alloy droplet, the diameter of the selected deposited droplet is: 300 microns, the thickness of the deposited layer is 250 microns, the selected laser power is 3KW, the spot size is 350 microns, and the scanning speed is 5m / s;
[0032](2) According to the layered data information of the parts, the computer sets the appropriate deposition substrate temperature as: 550°C, the injection frequency of metal droplets is 10Hz, and the speed of the moving platform is 3mm / s, and deposits a single point by point according to the scanning deposition path. level;
[0033] (3) Move the deposited single layer to the laser cladding area, turn on the laser and set the laser power to 3KW and the spot size to 350 microns, and set the appropriate roller cladding depth to 50 microns and The pressure is 0.5MP;
[0034] (4) Control the vibrating mi...
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Abstract
The invention discloses a surface quality control device for a three-dimensional (3D) part formed through metal drop printing and a control method of the surface quality control device. The surface quality control device comprises a computer system, a metal drop spraying head, a laser device, a scanning galvanometer, a galvanometer motor, a movement platform, a deposition base plate, a driving motor, a flat covering roller, a roller motor and a charge-coupled device (CCD) camera. The surface quality control device is characterized by further comprising a laser power regulator, a flat covering roller height adjuster, a base plate temperature control device, a flow edge scraper and the like. According to the surface quality control device, the laser device is used as an energy source, rapid surface fusion covering of a formed layer is achieved through laser beams through the scanning galvanometer, and the flat covering depth and the pressure of the roller are controlled through the flat covering roller height adjuster; in the state that metal drops or melt on the surface layer is not completely solidified, the metal surface which is fusion-covered rapidly is scraped and pressed in a directional mode by controlling the speed of the movement platform and the speed of the flat covering roller, so that secondary spreading and filling of the metal surface are achieved, the formed layer which is scraggly originally is flattened through rolling, and control over the surface quality of the layer is completed; in addition, real-time detection and feedback of the rolling flattening effect are achieved through a CCD image detection system.
Description
technical field [0001] The invention relates to the technical field of metal 3D printing additive manufacturing, in particular to a surface quality control device and a control method for metal droplet printing 3D parts. Background technique [0002] Metal droplet printing deposition forming technology is a method of directly manufacturing metal parts that combines layered manufacturing technology and droplet on-demand injection technology, and takes "part model discrete-material layer by layer" as the forming idea. This forming technology does not require special molds and expensive equipment, and can directly form complex three-dimensional metal structures. It has the advantages of low cost, high forming efficiency, wide range of material sources, flexibility, low energy consumption and no pollution. It has a good application prospect in the fields of micro-weapon system and equipment. However, the process of metal droplet printing and deposition forming parts is a dynami...
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