Laser rapid prototyping is a new manufacturing technology, which integrates CAD, cam, CNC, laser, precision servo drive and new materials. Compared with the traditional manufacturing direction, the prototype has higher repeatability and interchangeability; the manufacturing process has nothing to do with the set shape of the manufacturing prototype, realizing high technology integration, design and manufacturing integration. The following article will specifically introduce the new development and application of laser rapid prototyping technology.
The recent development of laser cutting technology mainly includes: stereo optical modeling technology, selective laser sintering technology; laser cladding forming technology; laser shaping technology; laser lamination manufacturing technology; laser induced heating stress forming technology and three-dimensional printing technology.
1. Stereolithography Technology
Stereolithography, also known as stereolithography rapid prototyping technology, is based on the principle of computer-controlled laser beam scanning point by point. The resin thin layer in the scanned area will produce photopolymerization reaction and solidify, forming a thin layer on the parts. At this time, the worktable moves down a layer thickness distance, so that a new layer of liquid resin can be applied on the cured resin surface, and the scanning processing of the next layer is carried out, and the processing operation is repeated until the whole prototype manufacturing is completed.
The advantages of this forming technology are: because there is no thermal diffusion, and the chain reaction can be well controlled to ensure that the polymerization reaction does not occur outside the laser point, so the processing precision is high and the surface quality is good. Colleagues can also manufacture complex and fine parts with high efficiency.
2. Selective laser sintering technology
Selective laser sintering (SLS) is similar to stereolithography, in which the liquid photopolymer is replaced by powder material, and the powder material is acted on with a certain scanning speed and energy.
The advantages of this forming technology are: wide selection of raw materials, easy cleaning of surplus materials and wide application range. It is suitable for the manufacture of prototype and functional parts.
3. Laser cladding forming technology
Laser cladding forming technology is mainly to NC the worktable, using laser beam to realize the scanning of powder, cladding processing, manufacturing the required shape. The precision and strength of forming parts are affected by many factors, such as slicing method, laser cladding layer thickness, laser output power and so on.
The main advantage of laser cladding is that it can be used to produce cnc machining parts with high density and even higher strength.
4. Laser lamination manufacturing technology
Laser laminated sheet manufacturing technology is a new rapid prototyping technology commonly used to make dies. The principle of this method is to use high power laser beam to cut metal sheet, then stack multi-layer thin sheet and change its shape gradually. Finally, the solid geometry of the prototype is obtained.
The main advantages of this forming method are: its cost is about 1 / 2 less than the traditional method, and the production cycle is greatly shortened. It can be used to make compound die, thin die, progressive die and so on.