Coaxial powder feeding 3D laser printing control method to suppress acceleration and deceleration printing high points

Abstract

The present invention proposes a coaxial powder-feeding 3D laser printing control method that suppresses the printing high point of acceleration and deceleration, including: detecting the printing speed of the laser printing head in real time, and controlling the laser printing when the printing speed is within the preset printing speed range of the uniform speed stage The output laser power of the head is the preset standard power of constant speed printing W 0 ; When the print rate is in the preset acceleration stage corresponding to the print rate range, control the output laser power W of the laser print head as: W=W 0 *V / V 加 , when the printing rate is in the preset deceleration stage corresponding to the printing rate range, control the output laser power W of the laser printing head as: W=W 0 *V / V 减 , where V 加 To match the end point print rate for the preset acceleration phase, V 减 Match the starting point printing rate for the preset deceleration stage, V is the detected printing rate of the laser print head. The present invention extracts the printing rate in real time, realizes the accurate matching between the fast-responding laser power and the change of the printing rate during the acceleration and deceleration process, and realizes the printing of the same layer and the same height.

Description

technical field [0001] The invention relates to the technical field of laser 3D printing, in particular to a coaxial powder feeding 3D laser printing control method that suppresses high points of acceleration and deceleration printing. Background technique [0002] Coaxial powder feeding 3D printing is to import the 3D graphic file of the designed part into the printing slicing software, and the slicing software generates the executable program code of the 3D printing controller according to the process setting and its own path algorithm. The 3D printing controller imports the code, controls the coaxial powder feeding print head to walk according to the planned path and speed according to the code, and controls the two main process parameters of printing laser power and powder feeding rate at the same time, and finally accumulates and prints the designed parts layer by layer. [0003] In 3D printing path control, various printing pauses will inevitably occur due to motor mov...

AI Technical Summary

Problems solved by technology

However, the biggest problem with this processing method is that the walking path will deviate from the planned path, and it is not suitable for the coaxial powder feeding 3D printing process that requires path accuracy.

2. Increase the acceleration and deceleration speed to shorten the acceleration and deceleration time: this method balances the powder feeding amount at the same distance by reducing the acceleration and deceleration time, and does not control and adjust the powder feeding process parameters, but for coaxial powder feeding 3D As far as the printing process is concerned, the acceleration and deceleration process of start and pause itself is very short, which makes this adjustment difficult to realize, and the coaxial powder feeding 3D printing is a process of accumulating layer by layer. Other problems caused by this short time adjustment Small problems will gradually be exposed due to the accumulation of multiple layers

3. Integrated processing method of adding and subtracting materials: This processing method is solved by an integrated 3D printer of adding and subtracting materials. The excess size formed by the printing high point can be cut and cut during the process of printing or adding materials, but this method is relatively purely adding materials. The advanced coaxial powder feeding 3D printing process has defects such as complex process and equipment structure, high printing cost, etc.

Therefore, there is no effective and economical solution to the printing high point problem caused by the acceleration and deceleration process in the coaxial powder feeding 3D printing in the prior art.

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