A path planning method for pressure vessel hemisphere additive manufacturing

Abstract

The invention discloses a path planning method for hemispherical additive manufacturing of pressure vessels. The method includes two schemes. One is to use a fixed heat source to realize the deposition path only through a two-axis positioner. The center of the hemisphere coincides with the center of the turning axis of the positioner. Every time a layer is deposited, after the positioner is turned over by the same angle, the rotation axis of the positioner rotates to achieve layer-by-layer melting and deposition to form a hemisphere. The other is to use a movable heat source, which requires a robot or other actuators to hold heat sources such as plasma arcs and electron beams. The actuators and the two-axis positioner move in coordination. Every time a layer is deposited, the positioner turns over at the same angle. The actuator drives the heat source to follow the deposited hemisphere for a certain distance, and the rotary shaft of the positioner rotates to realize layer-by-layer melting and deposition to form a hemisphere. The invention can directly and quickly form the hemisphere of the pressure vessel with complex shape, and has high forming efficiency and low cost.

Description

technical field [0001] The invention relates to a path planning method for hemispherical additive manufacturing of pressure vessels, which belongs to the technical field of additive manufacturing and is mainly used for rapid development of aerospace titanium alloy gas cylinders and storage tanks. Background technique [0002] A type of hemispherical pressure vessel represented by the supercritical helium storage tank of the launch vehicle has a large size, a diameter of more than 1 meter, uneven wall thickness, and high mechanical performance requirements. Traditional spinning and superplastic forming are difficult, and the requirements for equipment High, the amount of material removal is large, resulting in high processing costs and long forming cycles. Using the additive manufacturing method, no mold is needed, and hemispheres with complex shapes can be directly and quickly formed, with high forming efficiency and low cost. However, how to plan the additive manufacturing...

AI Technical Summary

Problems solved by technology

However, how to plan the additive manufacturing path to accurately shape the hemisphere of the pressure vessel is a technical difficulty, and there is no public report yet.

Images