Precision control method for laser directional energy deposition shape

Abstract

The invention provides a laser orientation energy deposition shape precision control method. The method comprises the following steps that an actual height value and an actual edge thickness value of a workpiece are acquired and converted through a first distance measuring sensor and a second distance measuring sensor; calculating a height difference value and an edge thickness difference value; and the workpiece is compensated in the lower layer deposition. According to the laser orientation energy deposition shape precision control method provided by the invention, the actual height value of the workpiece is acquired and converted through the first distance measuring sensor, and the actual edge thickness value of the workpiece is acquired and converted through the second distance measuring sensor; the actual height value and the actual edge thickness value are compared with a preset height value and a preset edge thickness value which are obtained through simulation calculation respectively, the difference value is calculated, the height difference value and the edge thickness difference value are obtained, compensation is conducted by adjusting machining parameters in lower layer deposition, and accurate control over the forming process is achieved; the shape precision of the workpiece is close to a preset value, and the size precision of workpiece machining is improved.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing, and more particularly, relates to a shape precision control method of laser directional energy deposition. Background technique [0002] Laser directed energy deposition uses a laser to melt powders. The way the powder feedstock is deposited and melted makes it easier to scale to larger additively manufactured parts. Laser directed energy deposition has high energy density and fast cooling non-equilibrium solidification characteristics, so that the prepared solidified structure is finer and the mechanical properties of the solidified structure are better. In addition, laser directed energy deposition adopts the method of synchronous powder feeding, and the production efficiency is high, so this method is widely used in petroleum, chemical, aerospace, biomedicine and other fields. [0003] The shape accuracy of additive manufacturing is a key factor affecting the molding quality. ...

AI Technical Summary

Problems solved by technology

At present, the main reason for affecting the shape accuracy in the laser directed energy deposition process is that the accumulation of molten powder cannot be accurately controlled. Affected by factors such as laser power, powder feeding rate, and powder feeding nozzle moving speed, the additive manufacturing of each layer There is a certain gap between the height (that is, the value in the Z direction) and the ideal value, which will affect the shape accuracy of the product in the Z direction

At the same time, the above factors will also affect the shape accuracy of the powder in the X and Y directions, so it is difficult to guarantee the overall shape accuracy of the product

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