Local heat input caused by the uneven temperature distribution, making the bath and the surrounding material to produce thermal stress caused by local thermoplastic deformation in the cooling and solidification of mutual restraint, and thus the thermal residual stress; melting region of the temperature gradient and cooling rate is inconsistent pool material during solidification due to the phase change the uneven volume changes and phase transitions of unequal nature of the phase transformation stress, thereby causing uneven plastic deformation and the formation of the phase change of residual stress (the stress). Forming the final residual stress is often the combined result of the above two reasons. green laser pointer can be classified into pen shape laser pointer, torch type laser pointer, bottle laser pointer, gun shape laser pointer or laser pointer with keychain or key ring and so on.
Laser rapid prototyping process is a very complex physical metallurgy process, the formation of residual stress by a number of factors is also very complex, size and distribution of stress and cladding powder materials (type, state), the substrate (material state), forming the path , forming the selection of dimensions and process parameters are closely related to the general three-dimensional residual stress. With the development of science and technology, plastic products are no longer just a roadside stall on the barrel, baskets, pots, bowls, but are widely used in automotive, electronics, medical equipment and even aerospace such as high-tech, sophisticated, cutting-edge areas . To be applied to these areas, in addition to the plastic material must meet the requirements, but also to solve the problem of processing. green laser pointer can be classified into the laser pointer with the safety lock, focusable laser pointer, laser pointer with multiple functions and laser pointer with pulse function.
Plastics in welding, cutting, carving, drilling and process of how to achieve precise, clean, fast, efficient, has become the urgent problem of the plastics processing industry. Traditional machining methods, the direct role of the drill and other machinery in the plastic parts, easy to make the plastic deformation of the workpiece, but also in the processing at the formation of flash, you also need some precision often fail to meet requirements, processing speed is relatively slow . The laser technology used in plastic processing, the above drawbacks can be avoided, greatly accelerate the speed of the plastic new research and development, so that the plastic application to enter the field of "high, fine, sharp". The focusable green laser pointer means that the focus of the laser pointer can be adjusted according to the actual situations to meet various practical needs.
The laser is the formation of a laser beam of light through the laser focus, precisely enormous energy to very small areas, a variety of materials, including plastic welding, cutting, engraving, marking, drilling and processing. Laser processing is a non-contact processing, mechanical impact force on the workpiece itself, the workpiece will not be deformed; small heat-affected zone, within the workpiece is not easy to produce thermal residual stress; can switch at any time after the positioning of the laser beam is focused, and computer programs, the energy and trajectory can achieve precise control, thus completing the sophisticated cutting and drilling and other work; It can also operate in the workpiece during the move, process automation, greatly improving the speed of production; the use of laser-welded seams and durable clean. green laser pointer can be separated by the wavelength.
Welding difficult to connect the modified rubber and glass fiber filled thermoplastic. Laser Marking is a certain identity, is also able to overcome the mechanical marking to change the surface quality of materials and easy to breed bacteria problems, the identity of playing high brightness, sharp edges on the plastic parts through the laser. Plastic medical equipment is often very small products, such as catheter hole diameter only 0.3 mm in the angioplasty catheter pore size is between 0.0076 to 0.025 mm, so tiny plastic pipe to be machined out with a laser is no other way. This pulse function of green laser is also very practical in the daily use for some special locations.
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