A selective laser melting powder recycling method

Abstract

This invention discloses a method for recovering powder from laser selective melting, relating to the field of additive manufacturing technology, including: taking powder from the same batch and calculating the residual powder rate σ after N consecutive printing operations. i Residual powder rate σ i After the i-th printing is completed, the weight w of the uncontaminated powder is recovered. i Compared with the powder weight w before this printing i‑1 The ratio, where i is an integer greater than or equal to 1, and N is an integer greater than 5; calculate the residual powder rate σ N times. i The average residual powder rate σ is obtained from the average value. n ; Calculate the sampling inspection period M, 0.6≤σ n M ≤0.8, M is a positive integer; Sampling and testing of recycled powder and replenishment of new powder are performed based on the sampling test cycle M. When the number of times recycled powder is printed is an integer multiple of M, sampling test is performed and it is determined whether to replenish new powder. If the sampling test result meets the requirements, a preset amount of new powder is added to the recycled powder, and it is mixed evenly before continued use. If the sampling test result does not meet the requirements, it is not used for the next printing.

Images