Research On The Mechanism And Experiment Of Thin Wood Laser Forming Based On LOM Technology

Rapid prototyping technology is an important symbol of the industrial revolution,and is widely used in many fields such as human clothing,food,housing,transportation,aerospace,high-end weapons,and medical equipment.Because of its advantages of short production cycle,high precision of molded parts and low price of raw materials,LOM is highly valued by global manufacturing and scientific research institutions,and has achieved rapid development in various industries.However,there are still many problems in the application of wood processing.In this paper,micron thin wood was used as the raw material of the LOM process,and its forming mechanism was studied to provide new processing ideas for the field of wood product forming.In this paper,the current situation at home and abroad was analyzed,the shortcomings of the existing LOM Process were described,and the processing process was adjusted.Combined with LOM technology,the structure and working principle of related processing equipment were described.The local carbonization on the surface of the formed parts was improved,the insufficient bonding strength caused by the early curing of the hot melt adhesive in the laser cutting area was solved,and the surface quality and mechanical properties of the formed parts were improved.Combined with the experiment,explore the process parameters that affect the quality of the molded parts in the LOM process.The CO2 laser was used to cut the thin wood veneer,the slit quality of the veneer was observed under the optical digital microscope,and the relevant factors affecting the slit quality in laser cutting were explored.Using SPSS software to carry out factor experiment design on the experimental data,combined with the variance analysis method to determine the laser cutting power,feed speed and the reasonable matching of relevant parameters have a significant impact on the cutting quality;Under the condition that the pressure and time of the hot press are constant,the laminated hot press forming experiment was carried out on the thin wood,the hot press temperature was controlled,and the bending strength and elastic modulus were used as the measurement indicators to further explore the hot press temperature on the quality of the molded part influences.According to the conservation of energy theory,the mathematical model for rational selection of relevant parameters such as wood properties,wood cutting thickness,laser cutting power and feed speed during laser cutting of thin wood was established,and the matching relationship between laser power,feed speed and thin wood thickness was solved.Black walnut veneer with different thickness was used as an experimental material for laser cutting,which is cut to verify the correctness of the theory.According to the wood heat transfer theory,the heat transfer control equations and boundary equations were established,and they are discretized by the forward difference method,and the temperature field inside the part was solved during the lamination heat pressing process based on MATLAB software.According to the data obtained from the simulation,a two-dimensional line chart was drawn to explain the influence law of the temperature change with the number of layers during the hot pressing process,and the dynamic adjustment of the temperature during the hot pressing process was realized.