1200烧粉机电控原理设计及调试(英语)

The powder material selectivity laser burns knot(Selected Laser Sintering, SLS Chien) to quickly take shape a technique, similar to SLA, is also scans each material with the laser beam, get the method of 3D entity thus, but replace liquid polymer with the powder(plastics powder, metal powder and porcelain and ceramics powder).Currently, with the rapid spare parts product of the craft's manufacturing market share about is 9%.
SLS takes shape principle:1.Before starting processing, have Chong first the utility room of nitrogen spirit heat, the temperature keeps below the melting point of powders. 2.Send to anticipate tube ascension while modeling, spread powder roller ambulation, spreads in working platform first the 1 F powder material, 3.The laser beam controls in the calculator under, according to cutting the noodles outline carries on burning knot to the outline end of solid parts of places and makes powder melt to combine to stick to knot mutually and subsequently forms the 1 F solid outline and hasn't yet the powder of burning the knot to still stay in the original place, is a propping up of next powder.4.After first floor burns knot completion, the work set descends the height of noodles layer, again spreads 1 F powder, carry on next burn knot, thus circulating, form 3D prototype spare parts.5.End after 5-10 hours cooling, can immediately take out spare parts from the powder urn.
SLS takes shape machine to be mainly burned by laser to knot a system, powder supply system, heat system and can ascend and descend a work set, and calculator to control system to constitute.
1.The choice of laser machine
Used for SLS to take shape a technical laser machine to mainly have 2 kinds:
(1)CO2 laser machine, the wave-length is 10.6 μ ms, belong to red outside and only scope, used for more burning of plastics powder knot;
(2) Nd:YAG laser machine, namely the Chan Nyu Yi aluminum garnet continuous laser machine, the wave-length is 1.06 μ ms, belong to near and red outside and only scope, used for more burning of metal powder and porcelain and ceramics powder knot.Basis:The powder is big to the absorption rate of laser.
The calculator controls system: SLS take shape the control system of machine mainly from the data processing and take shape to carry out organization two parts to constitute.
The data processing part includes 3D CAD model to set up, make use of the long-lost process software of processing the track to make the 3D model convert into a STL format, and carry on a slice to the model, get homologous two-dimensional outline, and to take shape an organization importation information.
Take shape to carry out the organization handles according to the data the part spreads of the information is controled equipments by the number to complete performance and control to proce
ss process.
SLS craft process:the SLS craft process is equally pided into three processes:Ex- handle, medium processing, behind handle.
Is e

x- to handle to be mainly carry on drawing and layering processing, behind handle mainly is a taking out of work piece, and cooling and surface processing.
Medium processing:Since the creation process of work piece fold to add process.
According to burning the dissimilarity of knotting the material to is pided into:The high mark sub- powder burns knot, metal powder to burn knot and porcelain and ceramics material creation.
Metal powder burns knot:Is pided into indirect metal to burn knot and direct metal to burn knot.
Indirectly burn to knot principle:Use metal powder and resin powder mixture system first the work piece burn knot and burn resin powder in which Rong, get the original shape of work piece at the same time, this process generally calls RP original shape for the sake of raising strength and again carries on two times and three times burns knot, again carry on metal of dissolve to ooze, get metal work piece.
Metal directly burns to knot a method:Metal powder the direct heat burn knot, burn to knot temperature to attain a metal melting point and get work piece process.
The porcelain and ceramics powder burns knot:Because the melting point of porcelain and ceramics powder is very high, burn to knot temperature Gao, the craft process is complicated.
Influence the factor that SLS takes shape quality:1 laser power the density and scanning speed come to a decision laser can to powder of heating temperature and time.The laser power density leads greatly and scan speed over small, the partial temperature then leads Gao, causes powder's gasifying and burns to knot surface cave convex http://doc.guandang.netser power density over small, scan speed to lead greatly, then powder's burning to knot insufficiency even can not burn knot, establishment of make strength low or can not take shape.2. Laser beam scanning the scanning that is apart from laser beam distance that is apart from an of meaning the close together laser scanning http://doc.guandang.netser scanning match that is apart from with laser beam radius will influence the quality that the laser burns knot.
SLS takes shape to use material and its characteristics: can used for the material of SLS technique to include:Nylon powder, reply the glass powder of binding the nylon, gather carbonic acid cosmetics, gather the powder of Mao An, wax powder, metal powder(model behind often the beard carry on burning knot and oozing a copper processing again) and reply to bind hot Ning resin of
fine sand, reply a wax porcelain and ceramics powder and reply wax metal powder etc..Request:Easily make into powder;The melting point is low.