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Fine casting method for super long lower pressure partition guide blade of turbine in stainless steel investment mold

A technology of investment casting and steam turbine, which is applied in the field of metal precision casting and can solve problems such as introducing technical details

Inactive Publication Date: 2009-09-02
HARBIN XINRUN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Fine casting method for super long lower pressure partition guide blade of turbine in stainless steel investment mold
  • Fine casting method for super long lower pressure partition guide blade of turbine in stainless steel investment mold
  • Fine casting method for super long lower pressure partition guide blade of turbine in stainless steel investment mold

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Embodiment Construction

[0038] The present invention selects a profile structure for pressing a single piece at one time, and the total shrinkage rate of the cavity is 2.5%. In the profiling design and manufacturing process, according to the characteristics of the blade itself, the actual situation such as uneven thickness, add appropriate process corrections to the parts that are difficult to predict and the deformation is not very regular. That is, at the steam inlet side where the hot joints are relatively concentrated, and the back arc is thinner, a part of the amount is worn off relative to the profiling part. Find out the regularity of blade deformation by exploring a certain number of blades. Calculate the light leakage value of each section of each blade relative to the detection sample, calculate the absolute value of the deformation part, and correct the cavity of the pressure type at the corresponding position of the pressure type.

[0039] In the selection of mold materials, paraffin wax...

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Abstract

The present invention discloses precise investing process of super long low pressure partition guide blade of stainless steel for turbine. Crankled stainless steel guide blade with length up to 960 mm and weight up to 42 kg may be manufactured through investing process. The present invention adopts pre-deforming profiling design and improved investing process and the produced guide blade for 600 KW steam turbo generator has high performance. The investing process includes making wax mold, making shell, smelting and casting, and heat treatment.

Description

Technical field: [0001] The invention relates to a metal precision casting technology, in particular to the precision casting of super-long low-pressure diaphragm guide blades of steam turbines. technical background: [0002] At present, my country's largest thermal power generation unit is a 600,000-kilowatt turbogenerator unit imported from Westinghouse Corporation of the United States. Among them, the material, mechanical properties, chemical composition, surface roughness, and geometric dimensions of the final guide vane of the low-pressure cylinder all have strict requirements. The tooling preparation for the investment casting process should be the design and manufacture of dies. attached Figure 1 It is the structural diagram of the final guide vane, and its shape, size, and profile are complex. It can be seen from the figure that the blade has a large degree of bending and torsion, the maximum wall thickness is φ62 mm, the thinnest part of the steam outlet is only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D25/02B22C9/00
Inventor 柳贤福高亚龙周洪礼
Owner HARBIN XINRUN IND
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