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Precision casting method for column crystal guide vanes of gas turbine

A technology of guide vanes and gas turbines, applied to casting molding equipment, casting molds, casting mold components, etc., can solve problems such as difficult processes, and achieve the effects of improving pass rate and large economic benefits

Active Publication Date: 2015-01-21
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to control the growth direction of the columnar grains, the size of the grains, and the average degree of deviation is very difficult in the process, and there is no successful precedent so far

Method used

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  • Precision casting method for column crystal guide vanes of gas turbine
  • Precision casting method for column crystal guide vanes of gas turbine
  • Precision casting method for column crystal guide vanes of gas turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a large-sized, complex-shaped, near-net-shape directional guide vane. The total length of the guide vane is 170mm, and the length of the blade body is 100mm. Figure 4 Design precision casting module, crystal pulling height is 220mm. EC95 was used to prepare the formwork, the calcination temperature of the formwork was 1450°C, the pouring temperature was 1550°C, and the pouring completion time was 5-10 s. After the pouring is completed, from bottom to top, first pull the mold shell 1020mm at a pulling speed of 15mm / min in order to fully select the crystal; then pull the mold shell 40mm at a pulling speed of 12mm / min; finally pull the mold shell at a pulling speed of 8mm / min The pulling speed is 160mm to pull the mold shell, and the mold shell is stretched completely.

[0036]

Embodiment 2

[0038] Preparation method of near-net-shape 1-stage oriented columnar guide vane for a certain gas turbine. The total length of the guide vane is 181mm, and the length of the blade body is 77mm. Figure 4 Design precision casting module, crystal pulling height is 230mm. EC95 was used to prepare the formwork, the calcination temperature of the formwork was 1500°C, the pouring temperature was 1550°C, and the pouring completion time was 5-10 s. After the pouring is completed, from bottom to top, the shell is first drawn at a drawing speed of 20mm / min to fully select crystals; then the drawing speed is reduced to 10mm / min; finally the drawing speed is 8mm / min.

[0039]

Embodiment 3

[0041] Preparation method of near-net-shape 1-stage oriented columnar guide vane for a certain gas turbine. The total length of the guide vane is 290mm, and the length of the blade body is 180mm. Figure 4Design precision casting module, crystal pulling height is 330mm. EC95 was used to prepare the formwork, the calcination temperature of the formwork was 1500°C, the pouring temperature was 1500°C, and the pouring completion time was 5-10 s. After pouring is completed, from bottom to top, the shell is first drawn at a drawing speed of 20mm / min to fully select crystals; then the drawing speed is reduced to 10mm / min; finally the drawing speed is 8mm / min.

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Abstract

The invention provides a precision casting method for column crystal guide vanes of a gas turbine. The precision casting method comprises the following steps: 1. a set of precision casting module is manufactured, and comprises a mold case and a chassis which are sequentially arranged from top to bottom; a wax pattern comprises a blade wax housing, an upper wax tread and a lower wax tread, two groups of vertically arranged seeding strips are embedded in the blade wax housing; the upper ends of one group of seeding strips correspond to inner arc shroud rings, and the lower ends of one group of seeding strips correspond to outer arc shroud rings; and the upper ends of the other group of seeding strips correspond to the outer arc shroud rings, and the lower ends of the other group of the seeding strips are flush with the bottom surface of the blade wax housing; 2. a group of seeding strips are embedded in the lower wax tread, and are vertically arranged around the section molded line of the vane bodies; 3. seeding sections are lined below tie bar bosses C and D; 4. materials are fused and poured into the precision casting module; and 5. the mold case of the precision casting module is withdrawn, so that the fuse is reversely sequentially solidified along the vane withdrawing direction, and a column crystal is formed. According to the column crystal guide vane bodies of the gas turbine manufactured by the invention, monoclinic crystals, crystal breakage and isometric crystal conditions are avoided, loosening and shrinkage cavity inside the vanes are avoided, the surface cracks are eliminated, and the column crystal guide vanes of the gas turbine are high in quality, high in efficiency and low in cost and can be applied to large-scale application and popularization.

Description

technical field [0001] The invention relates to a manufacturing method of a turbine guide vane, in particular to a precision casting method for a gas turbine column crystal guide vane. Background technique [0002] As the government pays more and more attention to energy and environmental issues, the development of efficient and clean heavy-duty gas turbine energy power turbine technology occupies an important position in the national energy development strategy. The continuous increase in the power of industrial gas turbines is achieved by increasing the initial temperature of the turbine, which requires the use of blade materials with higher and higher temperature-bearing capabilities. At the current level of gas initial temperature, the materials of high temperature components such as turbine moving and guide vanes are almost without exception nickel-based superalloys. Since the 1940s, nickel-based superalloys have developed from deformed superalloys and cast superalloys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22D27/20
CPCB22C9/04B22C9/22
Inventor 巩秀芳陶飞马德新张建平刘艳领杨功显
Owner DONGFANG TURBINE CO LTD
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