3D-printing sand core moulding method of large-scale hydraulic turbine blade

Abstract

The invention relates to a 3D-printing sand core moulding method of a large-scale hydraulic turbine blade. In the method, a wood mould manufacturing process in a conventional casting production process is free while a plurality of moulds of sand cores are designed in 3D-cartographic software. The sand cores are directly printed and moulded by a 3D printer and finally the sand cores are assembled layer-by-layer to complete the moulding process. In the method, the conventional mould manufacturing process is omitted so that the 3D-printing sand core moulding method is significantly reduced in production period, is reduced in production cost, is high in moulding accuracy, is low in labor intensity, is low in environmental pollution and is especially suitable for large-scale hydraulic turbine blade production in various models and in large production scale.

Description

technical field [0001] The invention relates to a 3D printing sand core molding method for large water turbine blades. Background technique [0002] Blades are one of the main components of water turbine power generation equipment. For hundreds of thousands of kilowatts of water turbines, the blades have a contour of several meters and a weight ranging from a few tons to a dozen tons. They are made of stainless steel and have high requirements for product quality. The blades of large water turbines are products with three-dimensional twisted and variable cross-section structures. The traditional casting molding process has the following disadvantages: the traditional molding needs to make blade wooden molds, and the cost of molds is as high as hundreds of thousands of yuan. The mold making cycle is more than one month, which often costs a lot of money and money. Extend the casting production cycle. In addition, traditional manual molding has low precision, difficult positio...

AI Technical Summary

Problems solved by technology

The blades of large water turbines are products with three-dimensional twisted and variable cross-section structures. The traditional casting molding process has the following disadvantages: the traditional molding needs to make blade wooden molds, and the cost of molds is as high as hundreds of thousands of yuan. The mold making cycle is more than one month, which often consumes a lot of money and money. Extend casting production cycle

In addition, traditional manual molding has low precision, difficult positioning, large core gap and deformation, which ultimately affect the size of the casting.

In addition, traditional molding sand cores are large in size and heavy in weight, which not only requires high labor intensity, but also often requires large-scale turning and lifting equipment, etc., which requires high workshop equipment.

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