Metal powder feed apparatus of metal powder laser forming system
A metal powder and laser forming technology, applied in the field of laser rapid prototyping, can solve the problems affecting the shape of powder spray cone, powder cone deformation, complex structure design, etc., to reduce the difficulty of processing technology, improve cooling efficiency, and avoid smoke pollution. Effect
Inactive Publication Date: 2009-07-01
SHENYANG INST OF AERONAUTICAL ENG
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Problems solved by technology
However, the coaxial powder feeding method also has insurmountable shortcomings: the coaxial nozzle is the coaxial output port for focusing laser, converging powder and converging shielding gas, and includes complex cooling channels, so the structural design is particularly complicated; For radiation burn nozzles, copper with high thermal conductivity is generally selected as the nozzle material. Since the axis of the powder injection cone, the axis of the laser beam and the axis of the shielding gas injection cone are coaxial, the processing technology of using copper as the nozzle material is relatively difficult; in addition, for relatively In the laser transmission focusing mode at low power, in order to avoid lens contamination, the laser outlet needs to output shielding gas, which seriously affects the shape of the powder injection cone; for the laser reflection focusing mode at higher power, the mirror cannot be protected by gas. Reflectors are particularly prone to contamination; since the cross-section of parallel CO2 laser beams is generally rectangular, the focused spot is a small rectangle at low power, and a myopic ellipse at high power, rather than circular spot
However, at the powder nozzle of the coaxial powder feeding mechanism, the strong carrier gas pressure, the protective gas pressure of the focusing mirror and the reflection of the substrate will make the air flow at the nozzle extremely complicated, resulting in serious deformation of the powder cone and poor powder convergence effect
[0008]Moreover, with the continuous improvement of the complexity of laser processing movement, the currently widely used two-axis linkage laser tube is far from meeting the needs of laser processing movement; The widely used CO2 lasers are all high power above 5KW, and the transmission focusing method based on ZnSe crystal lens is becoming less and less suitable for the focusing application of high-power lasers
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] Such as figure 1 As shown, the powder delivery path of the present invention is separated from the laser optical path, and the focused laser is incident sideways, including a swingable side laser cylinder 1, a vertically fixed laser cylinder 2, a parallelogram mechanism 3, a powder nozzle support 4 and a vertical powder nozzle 5 . The swingable lateral laser tube 1 is installed on one end of the vertically fixed laser tube 2 as an active part, such as figure 2 , image 3 As shown, the swingable lateral laser tube 1 is provided with a worm wheel 7, and the worm 8 is located on one side of the worm wheel 7 and meshes with the worm wheel. The pair becomes oscillable sideways for the reciprocating swing of the laser tube 1 around its axis. The swingable lateral laser cylinder 1 is a three-axis linkage laser cylinder, which means that the X-Y-CY axes a...
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Abstract
The invention relates to laser quick shaping technology, in particular to a metal powder feeding device of a metal powder laser shaping system of side laser and perpendicular powder feeding. The metal powder feeding device comprises a swing side laser drum, a perpendicular fixed laser drum, a parallelogram mechanism, a powder nozzle support piece and a perpendicular powder nozzle, wherein through adjusting inclining direction and inclining angle, laser facula output from the swing side laser drum is in the shape of a square at low power and an approximate circle at high power; the perpendicular powder nozzle adopts a carrier gas unloading opening device and a central cooling water chamber mode, and has the function of screw thread adjustment of powder ejection port; and the swing side laser drum and the perpendicular powder nozzle are connected through a parallel four-rod mechanism to realize linkage, thereby ensuring that the convergent points of focused laser and focused powder coincide with each other all the time. The metal powder feeding device has decomposed mechanism, simplified structure and lower process difficulty; a powder nozzle cooling chamber is relatively enlarged to improve cooling efficiency; and the device can effectively prevent soot formed during cladding from polluting a focusing mirror.
Description
technical field [0001] The invention relates to laser rapid prototyping technology, in particular to a metal powder feeding device of a metal powder laser forming system. Background technique [0002] The laser is one of the greatest scientific inventions of the twentieth century, with enormous technological potential. Laser processing is the most promising field of laser application. More than 20 kinds of laser processing technologies have been developed abroad, among which laser cladding technology is currently one of the most active laser processing technologies. Rapid prototyping technology is a new manufacturing technology that emerged in the late 1980s and developed rapidly. It is considered to be a major breakthrough in the field of manufacturing technology in the past 20 years. Its impact on the manufacturing industry can be compared with the appearance of numerical control technology. Metal powder laser forming technology is a combination of laser cladding technolo...
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IPC IPC(8): B22F3/105
Inventor 王维尚晓峰回丽王志坚杨光
Owner SHENYANG INST OF AERONAUTICAL ENG