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An investment casting method for double integral casting directionally solidified turbine guide blades

A technology of turbine guide vanes and investment casting, which is applied in casting molding equipment, casting molds, casting mold components, etc., to achieve the effects of high seeding efficiency, avoiding metallurgical defects, and ensuring wall thickness and dimensional accuracy

Active Publication Date: 2020-08-11
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address metallurgical defects such as inclusions, looseness, miscellaneous crystals, transverse grain boundaries, outcropping grains, and crystal orientation deviations existing in the preparation process of the existing duplex integrally cast hollow turbine guide vanes, as well as dimensions such as excessive wall thickness. The problem is to provide an investment casting method for double-integrated directional solidification turbine guide blades, the purpose of which is to improve the qualified rate and production efficiency of the blades, and shorten the development and production cycle of the blades

Method used

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  • An investment casting method for double integral casting directionally solidified turbine guide blades

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Experimental program
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Embodiment 1

[0025] When preparing the ceramic core, first press and sinter a ceramic core with the same shape as the ceramic core, and the circumferential dimension is 0.5mm smaller than the design size of the ceramic core, then pre-place it in the core mold, and press the shell outside the cold core , to form a complete ceramic core after sintering; the material of the cold core is the same as the ceramic slurry used to prepare the ceramic core shell;

[0026] After the ceramic core is made, the blade wax mold is pressed, and the feeding bend 6 is a wedge-shaped block with a length of 30mm, a height of 10mm, and a thickness transition from 1mm to 3mm;

[0027] The thickness of the seeding segment 3 wrapping the core head is 0.5-2 mm;

[0028] Exhaust side wax sheet 8 has a width of 5mm and a thickness of 3mm;

[0029] The blade body 9, the inner edge plate 10 and the outer edge plate 11 in the blade wax model are integrally injection molded, the injection temperature is 63-70°C, the inj...

Embodiment 2

[0035] Compared with embodiment 1, the differences of this embodiment are:

[0036] The size of the cold core is 2mm smaller than the single side of the core;

[0037] Feeding bending piece (6) is long 20mm, high 15mm, and the wedge-shaped piece that thickness transitions to 4mm by 2mm;

[0038] Exhaust side wax sheet (8) has a width of 3mm and a thickness of 2mm;

[0039] The number of shell coating layers is 8;

[0040] The smelting and pouring equipment is a vacuum induction directional solidification furnace. The shell is kept warm for 30 minutes after reaching the temperature. The IC10 alloy is selected for refining at 1535°C. After that, the temperature of the upper heater is controlled at 1480°C, the temperature of the lower heater is 1490°C, and the pouring temperature is 1480°C. The pulling rate is 8mm / min.

[0041] After the casting is released from the furnace, the shell is cleaned with high-pressure water. After the sprue is cut off, it is corroded in an aqueous...

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Abstract

The invention discloses an investment casting method for duplex overall-cast directional-solidified turbine guide blades. The method comprises the steps of preparation of ceramic molding cores, placement of the ceramic molding cores in shape molds for pressing of blade wax molds, coating of molding shells after mold assembly and dewaxing roasting, smelting and pouring, shell removal, core removal,and cutting of redundant gate parts. The method is simple and feasible in process, can effectively reduce such metallurgic defect rejection rates as inclusion, looseness and crystal orientation deviation of the blades, improves the casting size precision, greatly improves the product pass percent, reduces the economical loss, and cam meet large-scale production demands.

Description

technical field [0001] The invention relates to an investment casting method for a double integral casting directional solidification turbine guide vane, which belongs to the technical field of investment precision casting superalloys. Background technique [0002] The increase of the temperature before the turbine is crucial to the increase of the thrust-to-weight ratio of the engine, and the guide vanes of the high-pressure turbine directly bear the impact of high-temperature gas, which puts forward extremely high requirements for its temperature bearing capacity and reliability. On the one hand, the improvement of the temperature bearing capacity comes from the optimization of the alloy composition and microstructure. Compared with the traditional equiaxed grain blade, the columnar grain eliminates the transverse grain boundary that is prone to cracks, and greatly improves the fatigue performance of the blade. On the other hand, it comes from the optimization of structura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C9/08B22C9/10B22C9/22B22C7/02
CPCB22C7/02B22C9/043B22C9/082B22C9/10B22C9/22
Inventor 杨泽南王祯张强姜华陈昊彭子超王旭青罗学军马国君
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS