Temperature control device and method for additive manufacturing

Abstract

The invention discloses a temperature control device and method for additive manufacturing. According to the temperature control device, a front preheating part is arranged at the front end of a printing head, and a rear cooling part is arranged at the rear end of the printing head. Before a formed part enters a printing position, the difference between the surface temperature of the formed part and the temperature of a printing portion can be reduced, and the frequency of the phenomenon that due to the large temperature difference, the organizations of the formed part are not uniform can be reduced. Due to the fact that the rear cooling part is arranged behind the printing head, the formed part can be rapidly cooled by the cooling gas after printing is accomplished, the situation that dueto the fact that the temperature is too high, the formed part is oxidized by the surrounding air is avoided, and the surface quality of the formed part is improved. According to the temperature control system and method for additive manufacturing, on the basis of control over the temperature of a molten pool in the additive manufacturing deposition process and the cooling speed in the solidification process, the front preheating device and the rear cooling device are added, and therefore zone control of the temperature field of the formed part is achieved, the forming defect is avoided, the distribution of the temperature field in the additive manufacturing process is improved, and the internal property of the formed part can be improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of additive manufacturing (AM), and relates to the application of welding additive manufacturing of metal components by means of arc, plasma, laser, etc., and particularly relates to a temperature control device for additive manufacturing and a control method thereof. 【Background technique】 [0002] Additive manufacturing is a manufacturing technology based on computer-aided design (CAD) model data and realized by layer-by-layer accumulation of materials; compared with traditional subtractive manufacturing, such as turning, milling, planing, grinding, drilling, etc., additive manufacturing It is a kind of "bottom-up" manufacturing, which can effectively shorten the product development cycle. It has huge application potential and is developing rapidly. [0003] Additive manufacturing of metal components is an important application direction in this field, and its mainstream processes include arc, electron b...

AI Technical Summary

Problems solved by technology

Usually, in the additive manufacturing process of metal components, heat will continue to be generated and diffused, and components of different shapes will have different heat accumulation effects during the forming process, resulting in inconsistent internal properties of components, uneven structure, coarse structure and Severe component segregation and other phenomena increase the difficulty of structural performance regulation and local performance customized manufacturing of components

[0004] Specifically, before the molded part enters the additive manufacturing printing position, if the temperature difference between the surface temperature of the molded part and the additive manufacturing printing part is large, it is very easy to cause defects in the forming of the molded part and affect the processing index; Afterwards, the surface of the molded part still maintains a relatively high temperature, and it is extremely vulnerable to pollution or oxidation of active ingredients in the surrounding environment without protection

[0005] The existing technology, based on the expert system or processing experience data to formulate static or graded molding schemes, has very limited control effect on the temperature of molded parts

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