Light-curing quick moulding method based on LCD space light modulator and device

Abstract

The invention relates to an optical solidifying fast shaping method and a device based on a crystal space photomodulator. The device consists of a computer, a crystal space photomodulator, a convex lens, an ultraviolet lamp, an ellipsoidal mirror, a resin slot, a splint, a lifting device and a striking device. The realizing means include the following steps of: calculating a phase gray image of the sectional view of a model by the GS arithmetic; inputting the phase gray image into a control unit of the crystal space photomodulator. Parallel ultraviolet lights after passing through the crystal space photomodulator irradiates on the surface of liquid photosensitive resin. An exposure mode is controlled; after a shaping layer reaches a certain solidifying degree, a shaping platform is descended to the height which is equal to the thickness of one layer; a layer of the liquid photosensitive resins with a certain thickness is coated on the shaping surface; then the solidifying on the next layer is carried out; each layer is exposed and irradiated until the fast shaping piece is manufactured. The invention integrates the laser beam shaping technology into the optical solidifying fast shaping technique, thus having the advantages of fast speed, simple technique, relative low cost and being suitable for automatization production.

Description

technical field [0001] The invention relates to the field of rapid prototyping, in particular to a photocuring rapid prototyping method and device based on a liquid crystal spatial light modulator. The method has the advantages of fast prototyping speed and low cost, and can be widely used in the rapid prototyping field. Background of the invention [0002] Rapid prototyping is a new type of manufacturing technology that emerged and developed in the late 1980s. It is a tool for computer-aided design (CAD), computer-aided manufacturing (CAM), computer numerical control (CNN), laser, new materials, precision servo, etc. development and integration of the technology. A series of rapid prototyping methods have been developed around the use of computer control technology. For example, the SLA (Stereolithography Apparatus) method developed by Charles Hul was granted a US patent (patent number US4575330) in 1984. In 1988, the US 3D System Company launched a commercial prototype SL...

AI Technical Summary

Problems solved by technology

One of its disadvantages is: the scanning is made of points into lines, and then the lines are composed of surfaces, which takes a long time and the forming speed is slow; the second disadvantage is: the laser tube is expensive and has a limited life, and this method has high investment and operating costs

The SGC method is also known as the mask curing method. It uses a light leaking plate similar to a projection film to generate light and shadow consistent with the cross-sectional view of the model through the light leaking plate and irradiates the surface of the liquid photosensitive resin to cure the resin. Although this method uses surface exposure The way of point-by-point scanning is replaced by the method of point-by-point scanning, which improves the molding speed. However, using this method needs to make a light-leaking sheet for each layer of the molding model in advance. The procedure is complicated, the use cost is high, and the degree of automation is low. Therefore, this method has always been not promoted

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