Zero return control method and control device of three-dimensional printing platform in bottom projection type rapid prototyping

Abstract

A return-to-zero control method and control device for a three-dimensional printing platform in bottom projection-type rapid prototyping. The return-to-zero control method for a three-dimensional printing platform specifically comprises: when a three-dimensional printing platform descends to the bottom of a resin tank, detecting, in real time, a corresponding signal value between the three-dimensional printing platform and the bottom of the resin tank; transmitting the detected corresponding signal value to a control system; the control system compares the received corresponding signal value with a preset threshold, so as to control an action of a lifting motor that drives the three-dimensional printing platform to move, so as to finally make the three-dimensional printing platform back to a return-to-zero state, wherein the corresponding signal value is an acting force or a torque generated between the three-dimensional printing platform and the bottom of the resin tank, or a relative position between the three-dimensional printing platform and the bottom of the resin tank. The present invention implements automatic control, has a high return-to-zero precision, prevents the three-dimensional printing platform from being tightly pressed at the bottom of the resin tank, avoids affecting the service life of the resin tank, also prevents a gap between the three-dimensional printing platform and the bottom of the resin tank from being excessively large, and avoids affecting production.

Description

technical field [0001] The invention relates to the technical field of bottom projection rapid prototyping, in particular to a zero return control method and control device for a three-dimensional printing platform in bottom projection rapid prototyping. Background technique [0002] The basic working process of the bottom projection type digital light processing rapid prototyping system is as follows: First, the 3D printing platform controlled by the lifting axis stops at the bottom of the resin tank filled with resin through the zero return action, and leaves a suitable gap with the bottom surface of the tank , the lifting shaft is driven by the lifting motor, and then the laser surface is cast on the bottom of the resin tank to solidify the resin in the gap to form the first layer. The cured resin is firmly adhered to the 3D printing platform, and then the 3D printing platform rises one layer, and the laser surface Continue to cast the second layer at the curing place at ...

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method and control device for returning to zero of the three-dimensional printing platform in the bottom projection type rapid prototyping, which is used to solve the problem of low precision of the returning to zero operation in the prior art

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