Surface recombination energy machining method for high-water-head impact type runner bucket

Abstract

The invention discloses a surface recombination energy machining method for a high-water-head impact type runner bucket. The surface recombination energy machining method comprises the following stepsthat 1) clamping is conducted; 2) mounting is conducted; 3) the machining reference of a runner is determined; 4) a written machining program is executed by using a Hauck energy actuator A, and the surface of the runner bucket is machined; 5) a written machining program is executed by using a Hauck energy actuator B, and the root of the runner bucket is machined; and (6) after surface recombination energy machining of one bucket is completed through the step 4) and the step 5), indexing is conducted through a numerical control rotary workbench of a machining center, and machining of other water buckets one by one is achieved through the same steps. According to the surface recombination energy machining method for the high-water-head impact type runner bucket, anti-fatigue manufacturing of the root of the bucket is achieved, the anti-fatigue degree of the root of the bucket is improved, generation of fatigue cracks is reduced, mirror finishing of the inner side space molded surface ofthe bucket is achieved, a nano layer is directly machined on the inner side space molded surface of the bucket, residual tensile stress of the root of the bucket and a water cutting blade is eliminated, height-controllable pressure stress is preset, and the service life of the impact type runner is prolonged.

Description

technical field [0001] The invention relates to a method for processing a runner bucket, in particular to a method for processing the surface of a high-head impact type runner bucket with composite energy. Background technique [0002] At present, in the hydraulic turbine industry, the high head impact runner is the core component of the hydroelectric generator set, and is the part most prone to wear and fatigue cracks during the operation of the unit. Among them, the generation and expansion of fatigue cracks will directly affect The operation of the hydroelectric generator set is safe. Therefore, the anti-fatigue performance of the high head impact runner is high, which is the safety guarantee for the operation of the unit. [0003] When the existing impact runner water bucket is manufactured, it is generally ground and polished manually after rough and finish machining by numerical control; after manual grinding and polishing, its surface roughness can only reach Ra3.2, a...

AI Technical Summary

Problems solved by technology

[0003] When the existing impact runner water bucket is manufactured, it is generally ground and polished manually after rough and finish machining by numerical control; after manual grinding and polishing, its surface roughness can only reach Ra3.2, and other operations cannot be performed. Surface treatment: after several years of operation of the impact runner after being ground and polished in this way, through flaw detection, it is found that fatigue cracks of different lengths and sizes will appear in the water bucket of the impact runner, which directly affects the operation safety of the turbine unit and reduces Extended service life and increased operating costs

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