Topological optimization design method of friction stir welding robot base structure

Abstract

The invention relates to the field of structural analysis of friction stir welding robots, in particular to a topological optimization design method for a base structure of a friction stir welding robot, which comprises the following steps: step 1, determining analysis factors; 2, dynamically and optimally designing the base to obtain a topological optimized structure of the base; 3, further optimizing the relation between the sand outlet holes of the rib grid units and the inherent frequency of the rib grid units; 4, further optimizing the relationship between the wall thickness and side length of a rib plate of the rib grid unit and the inherent frequency of the rib grid unit; 5, further optimizing the density of the rib grid units in the base, and determining the layer number of the ribgrid units and the size of a base frame; and 6, verifying the optimal scheme of the base structure. According to the method, through finite element analysis, the design variables sensitive to the optimization target of the base structure are found, a group of optimal solutions of the design variables in a specified multi-target weighted optimization algorithm are solved, and finally a reasonablescheme of structural design is given and used for improving the comprehensive dynamic performance of the base structure.

Description

technical field [0001] The invention relates to the field of structural analysis of a friction stir welding robot, in particular to a topology optimization design method for a base structure of a friction stir welding robot. Background technique [0002] Friction stir welding (FSW for short) is a new, energy-saving, environmentally friendly and efficient solid-phase joining technology invented by the British Welding Institute in 1991. At the beginning of the development of this technology, it was mainly used in the connection of aluminum alloys, magnesium alloys and other low-melting light metal materials to solve the problems of pores, joint strength weakening, and joint quality instability that often occur when welding such materials by conventional fusion welding methods. With the deepening of research and the maturity of technology, friction stir welding technology has been popularized and applied to the connection of some high melting point dissimilar materials, such as...

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Problems solved by technology

At present, the base, column, saddle and other large parts of the robot are mainly made of gray cast iron for casting processing, and the ram is the main load-bearing structural part, and because it is a cantilever structure, alloy steel is used for welding to ensure that the whole The rigidity of the machine, except the turntable, the mass of the whole robot weighs about 71 tons, and the outer envelope size of the whole machine is about 1.8m×1.8m×1.6m, which needs to be reduced. In the friction stir welding process, the welding speed, Rotation speed, downward pressure, axial pressure, torque, etc. will all have an impact on the welding process, thereby affecting the welding quality. Deviation, so while reducing the weight of the equipment, it is necessary to optimize the structure to ensure the overall rigidity of the equipment

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