Sand-mold molding method for water turbine blade

Abstract

A sand-mold molding method for a water turbine blade includes the following steps of model manufacturing, molding with the model, box closing and box erecting. By means of the sand-mold molding method for the water turbine blade, the sand consumption can be lowered, the production cost can be reduced, and the molding production cycle can be shortened.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a sand molding method for water turbine blades. Background technique [0002] With the development of high-efficiency and large-scale hydraulic turbines, my country has successively developed and constructed some large and medium-sized hydropower stations. In the environment of poor economic situation and fierce competition in the global foundry market, the profit margin of castings is increasingly compressed, and the delivery cycle required by customers is getting shorter and shorter. This requires the foundry to improve the quality of castings while reducing production costs, reduce the rework processing time caused by size and quality problems, and shorten the production cycle of castings. [0003] Large water turbine blades have complex profiles and large height differences. Sand casting usually adopts the method of forming cores, and two core boxes are made based on the po...

AI Technical Summary

Problems solved by technology

This method has the following shortcomings for the shape of turbine blades with an outline size exceeding 1500×1500×800mm and a casting weight exceeding 5t: First, the core box must be made for the positive and negative pressure surfaces of the blade. Due to the difficulty in the size and structure of the core box, the production cost Higher; secondly, the core molding method uses a large amount of sand, and the cooling time of the casting pressure box is long; thirdly, the core assembly process is complicated, and the precision is difficult to control. After pouring, there are easy gaps between the sand cores, and the casting size deviation is large

In addition, the molding method of the above-mentioned prior art has a complicated production process and a long production cycle.