Thursday, June 14, 2012

The transmitting terminal of green laser pointer areincluded

Formed parts of small, dense body and excellent overall performance; but on the other hand, the local heat input caused by the uneven temperature field would inevitably lead to local thermal effects, performance in the bath is inconsistent in the process of solidification and subsequent cooling, thus forming parts the formation of residual stress and deformation. Residual stress in the internal stress, have an adverse effect not only for forming parts of the static strength, fatigue strength and stress corrosion resistance, but also affect the stability of structure size and shape accuracy, will directly lead to serious crack defects. Forming pieces of the event of a crack, the forming process will be forced to terminate at the same time forming the metal parts can only be scrapped deal, which will significantly increase the manufacturing cost. This kind of   green laser pointer   can be used by the teachers, lecturers, astronomy enthusiasts, gallery guides and museum guides and so on.
Therefore, to give full play to the superiority of laser rapid prototyping technology, improve the forming part of comprehensive quality of laser rapid prototyping process of residual stress formation mechanism and distribution characteristics has important practical significance. Have begun to study abroad on the residual stress in laser rapid prototyping process has been reported, and domestic have not seen any research in this area reported. In this paper a preliminary analysis of the residual stress of laser rapid prototyping process, provide a basis for the residual stress distribution in the precise description and control of laser rapid forming process. The formation mechanism of residual stress distribution characteristics. Belong to the material thermal processing laser rapid prototyping, high-energy laser beam as a moving heat source, local thermal effects generated by the local heat input will lead to a certain residual stress and deformation. And at the same time the shell color of   green laser pointer   can be customized according to requirements of the customer.
This is mainly the laser beam interaction with the material to the formation of the molten pool undergoing rapid heating, melting and rapid cooling and solidification changes will inevitably produce a non-uniform thermal stress and phase transformation stress, the results caused by the uneven plastic deformation and the formation of residual stress. Specific laser rapid prototyping process energy is very concentrated, the molten pool and nearby parts beyond the speed higher than the surrounding area is dramatically heating and partial melting. This part of the material due to thermal expansion, thermal expansion by the surrounding cooler region constraint, resulting in (elastic) thermal stress. At the same time, due to the heated region temperature yield the ultimate decline in some areas of the value of the thermal stress exceeds its yield limit, therefore, the bath part of the formation of plastic thermal compression, cooling after a relatively shorter time than the surrounding area, narrower, or less smaller. And at the same time,    green laser pointer   can be used in some other locations.
Substrate cooling and contraction of the cladding layer solidification cooling constraints, and thus the formation of residual stresses in the cladding layer. Therefore, laser rapid prototyping process of residual stress because mainly due to the following two aspects: local thermoplastic deformation caused due to local heat input caused by the uneven temperature distribution, making the bath and around the material to produce heat stress, mutual restraint in the cooling and solidification , thereby creating a thermal residual stress; the melting region of the temperature gradient and cooling rate is inconsistent, bath uneven volume changes and phase change ranging from nature to produce the phase transformation stress due to phase change material in the solidification, thereby causing uneven plastic deformation and the formation of the phase change of residual stress (the stress). The star laser head of   green laser pointer   makes the green laser pointer emit the green laser in the some special star picture.
Forming the final residual stress is often the combined result of the above two reasons. 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. The water jet guided laser is a laser technology and water hybrid technology. This unique laser cutting process, a slender linear water jet is used as a waveguide, so that high-power laser shot on the workpiece. Compared to traditional laser cutting process. This kind of   green laser is well received in the market.

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