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Sand-mold molding method for water turbine blade

A water turbine and sand mold technology, which is applied to molds, mold cores, mold components, etc., can solve the problems of easy gaps between sand cores, long production cycle, and difficult structure, so as to reduce the difficulty of mold making and sand The effect of reducing the volume of the box and shortening the production cycle

Active Publication Date: 2017-05-03
KOCEL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Embodiment Construction

[0013] The invention provides a sand molding method for water turbine blades. By making a blade solid model corresponding to the water turbine blade, then placing the blade solid model in a sand box for quicksand modeling, and finally taking out the blade solid model, the blade solid model is in The gap left in the sand mold serves as the sand mold cavity for casting the turbine blades. The sand molding method of the water turbine blade comprises the following steps:

[0014] Step S300, model making: making a solid model of the blade corresponding to the blade of the water turbine, so as to use the solid model of the blade to form the contour surface of the blade casting during modeling; according to the contour line of the blade of the water turbine, make a frame slab for support by the frame slab and position the solid model of the blade; according to the shape of the frame slab, make conformal cores around the frame slab so that the conformal cores can be used to form the c...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/22
Inventor 程亚军何启良
Owner KOCEL STEEL
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