Making method of surface double-walled hollow turbine blade

Abstract

The invention discloses a making method of a surface double-walled hollow turbine blade, and belongs to the technical field of rapid casting. The method comprises the following steps: designing and preparing negative resin of a double-walled hollow turbine blade containing impact openings, and separately preparing a resin outer wall corresponding to a double-walled cooling channel, and resin prototype; making the ceramic core of the double-walled cooling channel through a compression molding technology, inlaying the ceramic core in the resin prototype, and respectively assembling the resin prototype with the outer wall and the resin shell to make resin prototype containing the ceramic core; making a ceramic mold blank containing the ceramic core through a gel injection molding technology, freeze-drying, carrying out degreasing pre-burning, and post-processing a ceramic mold; and making a turbine blade through a casting technology, and carrying out laser or electric spark processing to obtain gas film holes in order to make the cast blade containing the cooling channel, the gas film holes and the impact openings. The method is mainly used for making the double-walled hollow turbine blade containing the impact openings.

Description

technical field [0001] The invention belongs to the technical field of rapid casting, and in particular relates to a manufacturing method for double-walled hollow turbine blades. Background technique [0002] Turbine blade is a key part of power equipment, and it is listed as the first key part because it is the part with the highest temperature, the most complex stress and the worst environment. At present, the main manufacturing process of turbine blades is investment casting, and its technological process mainly includes the design and manufacture of core molds, pressed cores, design and manufacture of wax molds, wax injection for assembly, slurry coating, shell drying, Dewaxing, sintering, pouring metal, core removal, drilling and other links. The disadvantage of this method is that it is difficult to realize the manufacture of hollow blades with staggered inner cavity structure space. As the blade structure design becomes more and more complex, the traditional blade m...

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Problems solved by technology

The disadvantage of this method is that it is difficult to realize the manufacture of hollow blades with staggered inner cavity structure space

With the increasing complexity of blade structure design, traditional blade manufacturing methods are restricted by manufacturing technology, and it is difficult to meet the manufacturing requirements of new blades.

[0003] In order to solve the problem of poor temperature bearing capacity and low thermal intensity of blades, sweat cooling and laminate cooling technologies have been adopted abroad in recent years to further improve cooling efficiency; but how to manufacture double-layer cooling for sweat cooling with high quality and low cost The wall has become a major factor restricting this cooling technique

The current sweating cooling blades require the wall thickness and flow channel to be on the order of 0.5 mm, so in the manufacturing technology, it is necessary to complete the multi-scale structure manufacturing (the shape of the blade and the tiny flow channel structure), which poses a huge challenge to the manufacturing technology. challenge

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