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Loose control method for fine and long thin-wall crowned isometric crystal cast turbine blade

A technology of turbine blades and control methods, applied in casting molding equipment, casting molds, casting mold components, etc., can solve problems such as size difference, large internal stress, blade body cracks, etc., to expand the number of pieces, improve production efficiency, and reduce production. cost effect

Active Publication Date: 2018-06-19
GUIYANG AVIC POWER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existence of the ingate makes the size of the local area connecting the blade body and the ingate significantly different, which changes the temperature field and solidification process of the blade body. After solidification, it is easy to cause large internal stress, resulting in blade body crack

Method used

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  • Loose control method for fine and long thin-wall crowned isometric crystal cast turbine blade
  • Loose control method for fine and long thin-wall crowned isometric crystal cast turbine blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0032] 1. Wax mold preparation

[0033] Such as figure 1 As shown, in the looseness control method of a slender and thin-walled crowned equiaxed crystal casting turbine blade of the present invention, the wax mold combination adopts a straight plate-shaped module, and the runner is "I"-shaped, including the sprue cup 1 and The transition drainage cylinder 2 connected with the sprue cup 1, the tenon end runner 3, the blade crown end runner 8 and the center column tube 9 are composed. The tenon end runner 3 is connected to the blade tenon inner gate 4, the blade tenon inner gate 4 is connected to the blade tenon 5, the leaf crown end runner 8 is connected to the blade crown inner gate 10, and the blade crown inner gate 10 is connected to the The leaf crown 7 is connected. The welding positions on both sides of the "I"-shaped runner correspond to each other and are distributed symmetrically with respect to the central axis of the central column tube.

[0034] In this embodimen...

Embodiment II

[0041] Such as figure 2 As shown, in the looseness control method of a slender and thin-walled crowned equiaxed crystal casting turbine blade of the present invention, the wax mold combination adopts a circular mold group, including the sprue cup 1 and the transition set in communication with the sprue cup 1 Drainage cylinder 2, mortise end runner 3, blade crown end runner 8 and center column tube 19 are composed. The runner 3 at the tenon end is in the shape of a petal, and its position is equally divided along the circumference. The petal-shaped runner 3 at the tenon end is connected to the inner gate 4 of the blade tenon, and the inner gate 4 of the blade tenon is connected to the tenon 5 of the blade, and the runner 8 at the leaf crown end is round cake-shaped, and is connected to the inner gate 20 of the blade crown. The shroud ingate 10 is connected with the blade shroud 7 .

[0042] In this embodiment, the length of the blade is about 150mm, the maximum wall thicknes...

Embodiment III

[0049] The thickness of the insulation cotton used is 13mm. The implementation of the remaining steps is performed with reference to the wax mold preparation, mold shell preparation and smelting and pouring process requirements in Example I, Example II or Example III.

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Abstract

The invention relates to the technical field of investment pattern precision casting, in particular to a loose control method for a fine and long thin-wall crowned isometric crystal cast turbine blade. According to the provided loose control method for the fine and long thin-wall crowned isometric crystal cast turbine blade, a blade body inner pouring gate does not need to be additionally arrangedduring wax pattern combination, the opening design is made on a prepared shell when the 1 / 3 section of the middle portion of a blade body is wrapped by heat preservation cotton, the temperature at the blade body cotton wrapping opening position of the shell is low, solidification is fast, and the 1 / 3 section of the middle portion of the blade body can be promoted to be preferably solidified; goodfeeding can be provided for the preferably-solidified 1 / 3 section of the middle portion of the blade body through the non-solidified or slowly-solidified tenon end blade body 1 / 3 section and the blade crown end blade body 1 / 3 section, good feeding can be provided for the tenon end blade body 1 / 3 section and the blade crown end blade body 1 / 3 section through a blade crown inner pouring gate, a tenon inner pouring gate and a transverse sprue, accordingly, the sequential solidification mode that the 1 / 3 section of the middle portion of the blade body is preferably solidified can be achieved, andthe loose degree of the fine and long thin-wall crowned isometric crystal cast turbine blade can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of investment precision casting, in particular to a porosity control method for a thin-walled crowned equiaxed crystal casting turbine blade. Background technique [0002] The shape and size of aero-engine turbine blades vary greatly depending on the design of the engine. In general, aero-engine turbine blades with a length-to-width ratio of more than 3 are called slender blades, and blades with a minimum wall thickness of less than 1mm are called thin-walled blades. blade. Aeroengine turbine blades are manufactured by investment casting. The process used for casting equiaxed crystal blades is generally a rapid solidification process. Due to the existence of a certain temperature range for alloy solidification, the liquid alloy in the final stage of solidification of the blade casting or its hot spots The casting cannot be effectively fed, so porosity develops inside the blade casting. Part of the loosenes...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/08B22C9/22B22D27/04
Inventor 任维鹏陈通张丽辉关心光齐闯
Owner GUIYANG AVIC POWER PRECISION CASTING
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