Improvement of machining tool for outer ring groove of gas turbine
Gas turbines, commonly referred to as gas turbines, are essential power generation systems widely used in energy and aerospace industries. Among their key components, the stationary blade ring of the compressor plays a critical role in ensuring efficient airflow and overall performance. The outer ring of the stationary blade is characterized by its large diameter, high number of grooves, thin wall thickness, and low rigidity, making it highly susceptible to deformation during machining. Additionally, maintaining precise dimensional accuracy and groove profile consistency presents a major challenge in the manufacturing process. Therefore, achieving high-quality machining with accurate dimensions has become a pressing issue that requires effective solutions. This paper addresses these challenges by analyzing the specific characteristics of the stationary blade’s outer ring and examining the actual problems encountered during groove machining. It proposes an integrated approach combining optimized machining plans, improved tool holders, and the development of new cutting tools to enhance both machining accuracy and product quality. Figure 1 shows a schematic diagram of the outer ring groove of the stationary blade. As illustrated, tight tolerance control is necessary for dimensions h1 and b2, which are crucial for proper fit and function. Based on the product design and machining specifications, engineers selected a beam-moving gantry-type five-axis CNC machining center (as shown in Figure 2) and a custom-designed special milling machine (shown in Figure 3) to process the outer ring grooves of the stationary blades. After thorough design discussions, the initial machining plan was finalized as follows: Pre-milling straight grooves using a wave-edge carbide end mill → Rough shaping of the root groove using a high-speed steel forming cutter → Finishing the root groove size with a carbide end mill → Final finishing of the root groove profile using a high-speed steel forming cutter (see Figure 4). Angular Contact Ball Bearing,Sealed Angular Contact Ball Bearing,Angular Contact Thrust Bearing,Micro Angular Contact Ball Bearing Shanghai Yi Kai Cheng bearing Co., LTD , https://www.ykchbearing.com1. Determination of the Preliminary Machining Plan
Figure 1
