System and method for controlling deformation in the manufacturing process of metal part additive

Abstract

The invention belongs to the technical field of additive manufacturing and particularly discloses a system and method for controlling deformation in the manufacturing process of a metal part additive.The system for controlling deformation in the manufacturing process of the metal part additive comprises a rotating working table, a stress elimination device, a frequency detection device, a moldingdevice and a stress detection device. The stress elimination device comprises a vibration excitation table and a vibration exciter. The vibration excitation table is fixed to the vibration exciter, and a base plate is fixed to the vibration exciter. The vibration exciter is fixed to the rotating working table. The frequency detection device, the molding device and the stress detection device areinstalled above the base plate. When the system works, every time after to-be-molded parts are stacked by a plurality of layers by the molding device, and the inherent frequency of parts at the momentis acquired by the frequency detection device; the stress elimination device vibrates in the inherent frequency so that the inner stress of parts can be eliminated; then the inner stress of parts isdetected by the stress detection device; thus part deformation is controlled in the layer-by-layer stacking process of the parts; and the shape, size and precision of parts are improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and more particularly relates to a deformation control system and method during the additive manufacturing process of metal parts. Background technique [0002] The traditional manufacturing method of metal parts is the separation process of casting, forging and milling. First, the forging blank is cast, then repeatedly forged, milled and processed into various parts, and finally assembled into parts. Although this subtractive machining process can obtain parts that meet the quality and precision requirements, it has disadvantages such as long processing cycle, low material utilization rate, and low efficiency. [0003] The metal additive manufacturing technology is a new manufacturing technology that directly processes the digital model into a physical part by accumulating materials layer by layer. This technology opens the design shackles, releases the design imagination space, a...

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Problems solved by technology

For example, patent CN109746443A discloses a method for concurrently controlling the deformation and precision of parts in the process of additive manufacturing. It controls the position of the parts to be processed to remain unchanged during the processing, and at the same time implements different processes in different processing layers or the same processing layer. In order to achieve high-precision and high-performance additive manufacturing with one-step ultra-short process, but this method cannot eliminate the influence of stress on the deformation of formed parts

Patent CN106735967B discloses a shape-controlling method for ultrasonic vibration-assisted arc additive manufacturing, which improves the nucleation rate by applying non-contact ultrasonic vibration during the additive manufacturing process to refine the melt pool grains. At the same time, it reduces the internal defects of the formed parts and improves the mechanical properties of the parts, but this method cannot fundamentally eliminate the internal stress of the formed parts during the production process.

At present, stress relief and deformation control in the process of additive manufacturing are still blank

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