Method for automatically adjusting powder supplying amount of metal 3D printing machine

Abstract

The invention discloses a formula for automatically adjusting the powder supplying height of a metal 3D printing machine. The formula includes the following steps that S1, the size parameters x0 and y0 of a forming cylinder and the size parameter x0' of a powder supplying cylinder are input; S2, the values of x and y are obtained and input according to the contour of a current printing layer; S3,the layer thickness h0 of the current printing layer is obtained; S4, the powder supplying height is changed in real time according to the formula (please see the formula in the specifications); and S5, when the S1, the S2, the S3 and the S4 are conducted for the fifteenth time, the coefficient A is multiplied before the current powder supplying height calculating formula according to the waste material amount in a waste material collecting box, the value ranges from 0.9 to 1.5, and the powder supplying height is increased or reduced according to the waste material amount. The powder supplyingheight of the current printing layer can be dynamically adjusted in real time according to the part section area, the part placing position, the powder batch, the powder density changes in the forming cylinder and the powder supplying cylinder and changes of operators and other factors, and therefore the size of waste materials can be minimized on the premise that powder is fully spread on the current printing layer.

Description

technical field [0001] The invention relates to a method for calculating the powder supply amount of a 3D printer, in particular to a method for automatically adjusting the powder supply amount of a metal 3D printer. Background technique [0002] Selected area laser melting technology, also known as metal 3D printing technology, its working principle is as follows: figure 1 As shown in , first, use the existing slicing and laser scanning path planning software to design the path of the laser beam; then, the powder supply cylinder rises to a certain height, the forming cylinder descends to a height of layer thickness, and the powder spreading scraper will supply the powder The powder on the cylinder that is higher than the forming cylinder is pushed to the surface of the forming cylinder, and spread evenly, and the excess material is pushed to the remaining material collection box at the other end, and then the machine drives the laser beam to process the evenly spread powder...

AI Technical Summary

Problems solved by technology

Although this form of quantitative powder supply can prevent the remaining material from entering the powder supply tank directly, and can also improve the utilization rate of powder to a certain extent, however, according to the above-mentioned 3D printing principle description, it can be known that when parts are stacked and formed layer by layer, each The contours and shapes of one layer are all different, but the powder conveyed by the powder spreading body is quantitative, which will inevitably cause insufficient powder supply on the layer with a larger effective physical area, and some layers with a smaller effective physical area The amount of powder supplied exceeds the actual amount, resulting in a large volume of remaining material

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