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Sand mold casting method for medium-pressure 22nd-stage stationary blade of H-stage combined cycle turbine

A combined cycle and sand casting technology, which is applied in heat treatment and sand casting fields, can solve problems such as difficult to meet, and achieve the effects of reducing procurement costs, improving international competitiveness, and reducing pollution

Inactive Publication Date: 2014-07-30
上海宏钢电站设备铸锻有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to occupy the market, it is necessary to innovate products, reduce costs, and deliver quickly. Therefore, the investment casting process described above has been difficult to meet the requirements of the market and production enterprises

Method used

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  • Sand mold casting method for medium-pressure 22nd-stage stationary blade of H-stage combined cycle turbine
  • Sand mold casting method for medium-pressure 22nd-stage stationary blade of H-stage combined cycle turbine
  • Sand mold casting method for medium-pressure 22nd-stage stationary blade of H-stage combined cycle turbine

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Embodiment Construction

[0064] The specific implementation of the sand casting method for the medium-pressure 22nd-stage stator blade of the H-stage combined cycle steam turbine of the present invention is given below in conjunction with the accompanying drawings.

[0065] see figure 1 . A sand casting method for the 22nd stage stator vane of medium pressure stage H combined cycle steam turbine, comprising the following steps:

[0066] (1) Process design

[0067] ① Mold design: In order to improve production efficiency, two stator blades are set in the same sand box 1: the first stator blade 51 and the second stator blade 52 model.

[0068] ② Pouring position and pouring and riser design: According to the structural characteristics of the blade due to the obvious thickness gradient from the large end to the small end, in order to make the machining allowance as small as possible, the vertical pouring and riser (including the first riser 41 , The second riser 42) The body pouring method; this can f...

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Abstract

The invention discloses a sand mold casting method for a medium-pressure 22nd-stage stationary blade of an H-stage combined cycle turbine. The method comprises the steps of (1) process design, comprising design of a mold, a casting position, a casting head, a chiller system, a pouring cup and an exhaust groove, (2) raw and auxiliary material selection and control, comprising sand selection, coating selection and burden pretreatment, (3) pouring, comprising hot-mold hot pouring and control over molten steel tapping temperature and pouring temperature, (4) heat treatment, comprising normalizing treatment and tempering treatment, (5) chemical component detection, (6) mechanical performance detection and (7) product acceptance. A fired mold casting process is replaced with the sand mold casting method which is low in cost, short in period and wide in application, the manufacturing process is simplified, the production period is shortened, the manufacturing cost is reduced, the environmental pollution is reduced, the medium-pressure 22nd-stage stationary blade meets the quality requirement which can be satisfied by the blade cast by the fired mold casting process, and the international competitiveness of a product is improved.

Description

technical field [0001] The invention relates to the technical fields of sand casting and heat treatment, in particular to a sand casting method for the medium-pressure 22nd-stage stationary vane of an H-stage combined cycle steam turbine. Background technique [0002] The sand casting method of the medium pressure 22nd stage stator vane of the H-class combined cycle steam turbine belongs to the sub-project of the research project "Production and manufacture of important parts of the H-class combined cycle steam turbine", and the applicant unit is responsible for the research project. There is no domestic precedent for the manufacturing process of the 22nd stage stator blade of the medium pressure H-stage combined cycle steam turbine. Previously, the medium-pressure 22nd-stage stator blades of H-stage combined cycle steam turbines used in my country were all imported from abroad. However, foreign companies use the investment casting process to manufacture the medium pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22C9/08B22C1/22B22C3/00C21D1/28B22D27/04
Inventor 王亭杨明强张伟徐德民金翼岑
Owner 上海宏钢电站设备铸锻有限公司
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