Laser metal additive deposition temperature control method and system

Abstract

The invention relates to a laser metal additive deposition temperature control method and system. The laser metal additive deposition temperature control method comprises the following steps that a plurality of current temperatures are acquired when a powder feeding nozzle deposits a current deposition layer at current laser power, wherein the plurality of current temperatures are obtained by performing temperature acquisition on sediments sprayed by the powder feeding nozzle in a set range in a process of forming the current deposition layer; the average temperature of the current depositionlayer is calculated according to the plurality of current temperatures; the laser power of the next layer of the powder feeding nozzle is calculated according to the expected temperature, the averagetemperature of the current deposition layer and the average temperature of the previous deposition layer, the laser power of the next layer is taken as the current laser power, and a plurality of current temperatures obtained by the powder feeding nozzle is returned when the powder feeding nozzle deposits the current deposition layer at the current laser power until deposition ends. According to the laser metal additive deposition temperature control method and system, the control precision of the laser metal additive deposition temperature is improved.

Description

technical field [0001] The invention relates to the field of temperature control, in particular to a temperature control method and system for laser metal additive deposition. Background technique [0002] Laser deposition manufacturing technology is an advanced manufacturing technology that combines laser cladding technology and rapid prototyping technology. During the deposition process, as the accumulation continues, the heat dissipation conditions become worse, the temperature of the molten pool gradually increases, and the heat accumulation phenomenon is aggravated, which will lead to a decrease in the quality of the formed parts. Therefore, in order to improve the quality of formed parts, the monitoring and control of molten pool temperature is very important in the deposition manufacturing process. [0003] At present, one of the commonly used temperature control in the laser deposition manufacturing process is to change the value of the input process parameters acco...

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Problems solved by technology

[0003] At present, the commonly used temperature control of the laser deposition manufacturing process is to change the value of the input process parameters according to the measured molten pool temperature to achieve the purpose of reducing the molten pool temperature. Since the thermal reaction of the molten pool is relatively violent, continuous and stable measurement of the molten pool The temperature of the pool is relatively difficult. This method has poor stability, complex system, and high cost. The other method is to reduce the temperature of the molten pool by adding a cooling device in the environment. This method has low accuracy and cannot quantitatively control the temperature of the molten pool.

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