This piece is a light-transmitting piece, and the thickness of the sample after grinding is about 30 μ m. It is mainly used for lithofacies analysis of natural rocks and inorganic nonmetallic materials. For fragile or porous samples, it is necessary to soak and cook with resin glue before grinding; For inorganic materials with fine crystals, it is necessary to grind them thin for observation and analysis under polarizing microscope.
LOM process is called laminated entity manufacturing. Full name: laminated object manufacturing. It is also called SSM (Slice Entity Manufacturing) in China, and Michael Feygin of Helisys Company of the United States obtained the patent at 1985, and 1986 was successfully developed.
At present, the company has launched LOM- 1050 and LOM-2030 molding machines. LOM rapid prototyping technology was first developed by Helisys company in the United States. In this technology, sheets such as paper and plastic film are stacked layer by layer, and the laser beam only needs to scan and cut the edge of each layer, instead of scanning the whole surface layer like SL technology.
How LOM works:
The surface of the plate is coated with a layer of hot melt adhesive in advance, and the plate is hot-pressed by a hot-pressing roller during processing, so that it adheres to the workpiece formed below; Under the control of computer, CO2 laser cuts out the cross-sectional profile of the part and the outer frame of the workpiece on the new adhesive layer, and cuts out the grid aligned up and down in the redundant area between the cross-sectional profile and the outer frame.
After laser cutting is completed, the workbench drives the formed workpiece to descend and separate from the strip plate; The feeding mechanism rotates the receiving shaft and the feeding shaft to drive the material belt to move and move the new layer to the processing area; The workbench rises to the machining plane; Hot-pressing by hot-pressing roller, the number of layers of the workpiece is increased by one layer, and the height is increased by one material thickness; Then cut the outline on the new layer. This process is repeated until all parts of the component are bonded and cut, thereby obtaining a layered solid component.
LOM process takes thin materials (such as paper, plastic film or composite materials) as raw materials, and uses laser cutting system to cut the paper coated with hot melt adhesive into the inner and outer contours of the workpiece according to the cross-sectional contour data extracted by computer. After cutting one layer, a new layer of paper is superimposed by the feeding mechanism, and the cut layers are bonded together by the hot pressing device, and then cutting is carried out, so that a three-dimensional workpiece is finally formed by cutting and bonding one layer at a time.
On this rapid prototyping machine, the cross-sectional profile is cut and superimposed to form the product as shown in the figure. Among them, the required workpiece is surrounded by small squares of waste, and after removing these small squares, a three-dimensional workpiece can be obtained.