A Dense Deep Hole EDM Drilling Method for Ring Parts

Abstract

The invention relates to a dense deep hole electric spark hole making method for an annular part. The dense deep hole electric spark hole marking method comprises the following steps that firstly, a preparing stage is performed, wherein an electrode conduit is reformed; an external flushing liquid conduit is installed, so that inlet external flushing liquid can flow to the surface of an electrodetube along the outer surface of the electrode conduit; an outlet external flushing liquid nozzle is installed; the annular part is installed; the position of the outlet external flushing liquid nozzleis adjusted so that the spraying direction can be parallel to the central axes of deep holes; and a processing program is compiled, wherein the hole making process in the program is sequentially divided into a zero clearing stage, a repair stage, an inlet stage, a processing stage and an outlet stage, and processing parameters are correspondingly set in each stage; flushing is started; and the processing program is started; and secondly, a hole making stage is performed, wherein processing coordinates are made to return to zero through the zero clearing stage; the shape of the end of the electrode tube reaches the required shape through the repair stage; the shape of the end of the electrode tube is matched with the shape of the processing surface of the annular part through the inlet stage; the hole making of the main parts of the deep holes is completed through the processing stage; and the deep hole outlet processing is completed through the outlet stage. By the adoption of the method, electrode replacement procedures are set based on the principle of high efficiency and time saving.

Description

technical field [0001] The invention relates to electric discharge machining, in particular to a method for forming dense deep holes by electric discharge for annular parts. Background technique [0002] As an annular part, the aero-engine combustion chamber is densely packed with a large number of cooling holes on its circumferential side wall to reduce the temperature of the combustion chamber. The diameter of these cooling holes is usually φ1mm~φ3mm, and the depth of the cooling holes is The diameter ratio is between 2 and 10, and it is usually made by EDM. [0003] However, for cooling holes with a diameter of only φ0.7mm to φ1mm, a hole depth of 7mm to 9mm, and a number of more than 10,000 cooling holes, the conventional EDM hole making method has been unable to meet the processing requirements. [0004] The conventional EDM hole making method is mainly based on setting the inlet flushing liquid, and at the same time, the inlet flushing liquid output by the irrigation ...

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Problems solved by technology

[0003] However, for cooling holes with a diameter of only φ0.7mm to φ1mm, a hole depth of 7mm to 9mm, and a number of more than 10,000 cooling holes, the conventional EDM hole making method has been unable to meet the processing requirements.

[0004] The conventional EDM hole making method is mainly based on setting the inlet flushing liquid, and at the same time, the inlet flushing liquid output by the irrigation method is used to wrap the inlet. The processing stability of the hole exit position is also very easy to cause severe arcing and burn the parts, and it will also reduce the export processing speed

[0005] In addition, in the conventional EDM drilling method, only one set of processing parameters is usually set, and the mismatch between different processing positions and the set of parameters is not considered at all, resulting in poor processing quality and low processing efficiency

[0006] In addition, because the conventional EDM hole making method is mainly used for making holes in annular parts with a small number of cooling holes, the replacement of electrode tubes generally adopts a manual single-piece replacement method, and when the number of cooling holes exceeds 10,000 , it is obviously a waste of time to use manual single-root replacement, and the labor intensity will also increase significantly, which is obviously unable to meet production needs.

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