Three-dimensional rapid prototyping method and device based on pulse small hole droplet injection

Abstract

The invention relates to a three-dimensional rapid prototyping method and device based on pulse small hole droplet injection and belongs to the technical field of three-dimensional rapid prototyping. The three-dimensional rapid prototyping method is characterized in that a heater is used for heating a crucible until the metals in the crucible are in the molten state, a positive differential pressure value is set between the interior of the crucible and a vacuum chamber, simultaneously a piezoelectric ceramic driver applies certain pulse signals to piezoelectric ceramics to lead the piezoelectric ceramics to drive a transmission bar to generate longitudinal infinitesimal displacement, the infinitesimal displacement acts on the metal melt at the bottom of the crucible, tiny droplets are injected from small holes arranged at the bottom of the crucible, one droplet can be formed at the position of the small holes once the piezoelectric ceramics move for one time, size data of the droplets are timely analyzed through a photograph system, further the optimum parameter is obtained through adjustment; and the droplets fall to a moving three-dimensional motion platform to be deposited, and accordingly needed metal parts are formed through depositing. The three-dimensional rapid prototyping method and device based on pulse small hole droplet injection have the advantages that the pulse small holes inject to generate the metal droplets with uniform and controllable sizes, prototyped products are fine and uniform in microstructure, the prototyping process is strong in controllability, and the formed parts are high in accuracy.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional rapid prototyping, and in particular relates to a method and device for three-dimensional rapid prototyping based on pulse small hole droplet jetting. Background technique [0002] Rapid prototyping (RP for short) is a new type of manufacturing technology developed in the 1980s. Its core idea is to decompose a three-dimensional entity into two dimensions, process and accumulate layer by layer, and finally form a prototype. It breaks through the traditional processing mode, and can quickly manufacture parts with complex shapes without prefabricated cores or mechanical processing equipment, injecting new vitality into the development of mechanical manufacturing technology. Different from traditional mechanical processing methods such as "deformation forming" and "removal forming" of materials, RP is a new technology integrating computer-aided design, precision machinery, numerical control,...

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Problems solved by technology

[0004] The object of the present invention is to provide a method and device for three-dimensional rapid prototyping based on pulsed small-hole droplet jetting. Under the condition of controlling the pressure difference between the crucible and the vacuum chamber, the crucible is heated by a heater until the metal inside it is in a molten state. The piezoelectric ceramic driver is used to apply a certain pulse signal to the piezoelectric ceramic, so that it drives the transmission rod to produce a small longitudinal displacement. This displacement acts on the metal melt at the bottom of the crucible, so that tiny droplets are ejected from the small hole at the bottom of the crucible. A droplet can be formed at the small hole every time the ceramic moves; the droplet lands on the moving three-dimensional motion platform and deposits according to the scanning trajectory generated by the three-dimensional model of the workpiece, thereby depositing the required metal parts; the present invention solves the problem of existing liquid In droplet jet rapid prototyping, due to the non-uniform and uncontrollable droplet size, the defects of high porosity, poor density and low precision of the part

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