Quick resin forming method based on LCD (liquid crystal display) selective regional light transmission principle

A molding method and selective technology, applied in the field of photocuring molding, can solve the problems of large investment, high cost of parts manufacturing, high operating cost of the system, hindering the promotion and application of advanced technology and system, etc., achieving short molding time, simple and convenient replacement, low cost effect

Inactive Publication Date: 2014-04-16
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Light-curing rapid prototyping systems are generally too large in size, huge in investment, expensive in parts manufacturing

Method used

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  • Quick resin forming method based on LCD (liquid crystal display) selective regional light transmission principle
  • Quick resin forming method based on LCD (liquid crystal display) selective regional light transmission principle

Examples

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example 1

[0035] The invention adopts the principle of LCD selective area light transmission, and uses high-power 405nm LED light source for exposure molding; uses a stepping motor to control Z-axis movement; selects photosensitive resin with a peak photosensitive wavelength of 405nm as the material to be cured; and selects a five-pointed star model.

[0036] This example is carried out as follows: clean the resin storage tank, add resin after drying, and place it on the processing platform; use 3Dmax to draw the closed curve of the five-pointed star, and generate a three-dimensional model by lofting, with a height of 1.0cm, and save it as OBJ format; import the file into professional software to slice and discretize the surface model, adjust the slicing accuracy to about 200 μm, save the image of each surface model in jpg format; import these image files into the control software; set the light source exposure time to 3s, and Z-axis movement The system rises by 200 μm after each exposur...

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Abstract

The invention discloses a quick resin forming method based on an LCD (liquid crystal display) selective regional light transmission principle, belonging to the technical field of quick formation. The method is characterized by comprising the following steps: putting a resin liquid storage tank above an LCD screen, exposing layer by layer by adopting a contact exposure method, and putting a Fresnel lens between the LCD screen and a light source, wherein the thickness of each layer during curing is 200 microns to 400 microns, namely after the layer is exposed and cured, a forming piece supporting plate correspondingly moves up by 200 microns to 400 microns under the control of a Z-axis motion system, the curing time of the layer is 1 second to 8 seconds, and a model is washed by an organic solvent after being cured completely; the light source is a high-power LED light source; a glass substrate coated with silica gel is arranged at the bottom of the resin liquid storage tank, so that curing resin can be conveniently separated from the substrate. According to the method, the forming precision is high, the cost is low, and the curing time is quick. In addition, the LED light source is easy to replace, the power is adjustable; different types of resin can be cured and formed.

Description

technical field [0001] The invention relates to a photocuring molding method. A light-curing rapid prototyping system was designed by using the principle of LCD selective area light transmission and high-power light source drive. Background technique [0002] Rapid prototyping technology is an advanced manufacturing concept and manufacturing technology. It breaks through the traditional processing mode and can quickly manufacture workpieces with extremely complex shapes without mechanical processing equipment. The rapid prototyping of the model is realized by the cumulative method. A major breakthrough in technology. At present, rapid prototyping technology is developing in two directions: one is industrialized large-scale systems, which are used to manufacture high-precision, high-performance parts, and the other is automated desktop small-scale systems. Create concept prototypes. Stereo-curing rapid prototyping systems generally have large volume, huge investment, high ...

Claims

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Application Information

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IPC IPC(8): B29C67/00
Inventor 陈继民黄宽方浩博
Owner BEIJING UNIV OF TECH
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