A kind of electric spark modeling method for impeller with crown
An electric spark and impeller technology, which is applied in the field of electric spark modeling for impellers with crowns, can solve the problems of short circuit, arc drawing, affecting the quality of the air film hole hole wall, etc., and achieve the effect of ensuring the hole wall quality and avoiding arc drawing or short circuit.
Active Publication Date: 2022-07-15
JIANGSU JIANGHANGZHI AIRCRAFT ENGINE COMPONENTS RES INST CO LTD
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Problems solved by technology
[0003] However, during the long-term modeling and processing of crowned impeller blades, our company found that the existing technology still has certain disadvantages: 1. The structure of the gas film hole is small and deep, and before the end surface of the gas film hole is completely opened, the ultrasonic vibration It can only cooperate with the working fluid to bring out the electro-corrosion products on the side of the one-piece electrode near the orifice, but the electro-corrosion products located at the lower part of the one-piece electrode with a relatively large height and diameter in the hole cannot be effectively eliminated, resulting in arcing or short circuit. It affects the quality of the hole wall in the lower part of the air film hole; 2. Since the blade crown of the shrouded impeller is longer than the blade body of the blade, and the junction of the two has a certain structural angle, the integrated electrode is processed. There is an interference phenomenon at all times, and there is air flow interaction between the processed interference air film hole and the rest of the cooling air film hole, which leads to the cooling effect of the blade to be improved
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[0030] In order to make the technical means, creative features, achievement goals and effects realized by the present invention easy to understand, the present invention will be further described below with reference to the specific embodiments.
[0031] like Figure 1 to Figure 9 As shown, an electric spark modeling method for a crowned impeller includes the following steps:
[0032] S1: Install the workpiece: Install the workpiece to be processed on the EDM machine table, align and fix it;
[0033] S2: Hole alignment: The adjustment mechanism 3 is controlled by the robotic arm 2 installed on the base 1 to perform five-axis motion, so that the lower end of the tool electrode assembly 4 arranged at the end of the adjustment mechanism 3 is placed on the workpiece and the blade crown The hole to be machined between the blade roots;
[0034] S3: Conical hole machining: The liquid supply pump 5 pumps the working fluid for EDM into the adjustment mechanism 3 through the liquid su...
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The invention discloses an electric spark modeling method for a crowned impeller, and relates to the technical field of electric spark machining. In the present invention, the tool electrode assembly is arranged on the adjusting mechanism, and after the output end of the electric cylinder is reset and returned, the flow direction of the working fluid is completely changed to slant downward from the oblique flow hole on the electrode 1, and the single hole rushes into the cylindrical hole. This flow direction can effectively discharge the electric corrosion products located in the deep cylindrical hole, thereby avoiding arcing or short circuit phenomenon, ensuring The quality of the hole wall in the air film hole; by setting the mechanical arm and the adjustment mechanism, the oblique interference part of the workpiece can be avoided, and the air film hole can be smoothly processed at the to-be-machined position where the workpiece blade body and the blade crown meet.
Description
technical field [0001] The invention relates to the technical field of electric spark machining, in particular to an electric spark modeling method for a crowned impeller. Background technique [0002] The working conditions of the internal turbine blades of the aero-engine are very bad. They rotate at high speed under the impact of high-pressure corrosive gas. The structure mainly relies on the cooling air film holes opened on the end face for cooling. The micro-hole machining of the cooling gas film hole, that is, the workpiece is immersed and positioned in the EDM working fluid, and the conical hole and the cylindrical hole are directly machined on the machining surface by the rotating one-piece electrode, and the integrated ultrasonic vibration is assisted. Equipment to discharge the galvanic corrosion products produced during the EDM process. [0003] However, during the long-term modeling and processing of impeller blades with crowns, our company found that the existi...
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IPC IPC(8): B23H9/14B23H11/00
CPCB23H9/14B23H11/00
Inventor 吴江曹春晓严小琳
Owner JIANGSU JIANGHANGZHI AIRCRAFT ENGINE COMPONENTS RES INST CO LTD