Workpiece hammering reinforcing device during metal additive manufacturing and application method thereof

Abstract

The invention discloses a workpiece hammering reinforcing device during metal additive manufacturing and an application method thereof. The device comprise a hammering reinforcing device body, a linear motion part, a motion regulating part, a locking part, a hammering executing part, a hammering regulating support, a data processing and measuring control unit and a base and is characterized in that workpiece follow-up hammering reinforcing operation during the metal additive manufacturing is achieved by using the linear motion part and control flow based on process and working condition data. The workpiece hammering reinforcing device and the application method thereof have the advantages that the optimized process control flow is provided, a forming process can be favorably improved on the basis of an existing additive manufacturing system, and workpiece quality can be increased; the structure homogeneity of a formed part is increased, mechanical performance is improved while plasticity is enhanced, crack generation is inhibited, the fatigue life of the formed part is prolonged, the flatness of the surface of a formed layer is improved, and the dimensional precision of the formed part is increased effectively.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a hammer strengthening device for workpieces in the process of metal additive manufacturing and a method for using the same. Background technique [0002] In the additive manufacturing process, computer design software is used to make a 3D model of the workpiece, and then the 3D model is layered and sliced ​​in the computer to discretize the 3D model into a series of 2D layers, and path planning and parameter optimization are performed on each layer, and then Transform a 3D model into a solid workpiece by scanning layer by layer with an energy source and adding material layer by layer. [0003] However, in the existing metal additive manufacturing process, the molten metal melts and solidifies rapidly under a huge temperature gradient, and may be in local areas such as between layers inside the workpiece, between different overlapping lanes and lanes, e...

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Problems solved by technology

[0003] However, in the existing metal additive manufacturing process, the molten metal melts and solidifies rapidly under a huge temperature gradient, and may be in local areas such as between layers inside the workpiece, between different overlapping lanes and lanes, etc. Produce various special internal metallurgical defects; such as local lack of fusion, air gaps, entanglement and precipitation pores, cracks, and seriously affect the internal quality and mechanical properties of the formed workpiece

[0004] In the existing metal additive manufacturing process, the top interface of the molten pool is similar to an ellipsoid, the bottom interface of the molten pool is approximately horizontal, and the temperature of the molten pool interface changes continuously from the bottom of the molten pool to the top of the molten pool, resulting in thermal stress in the solidified and formed part; At the same time, due to the phase change of the material, residual stress will also be generated, which may cause defects such as pores, cracks and cracks, and affect the accuracy and mechanical properties of the surface of the formed workpiece.

[0005] In addition, the top interface of the molten pool of the molded workpiece is similar to an ellipsoid, resulting in poor flatness of the surface of the molded layer. With the accumulation of the molded layer and the continuous increase in the size of the molded part, it is easy to cause problems such as edge collapse and depression

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