Improvement of machining tool for outer ring groove of gas turbine
Needle Bearing,Flat Needle Roller Bearing,Needle Roller Bearings,Sealed Needle Roller Bearing Shanghai Yi Kai Cheng bearing Co., LTD , https://www.ykchbearing.com
July 04 10:43:29, 2025
Gas turbines, commonly referred to as gas turbines, are essential power generation systems used in various industries. Among their key components, the stationary blade ring of the compressor plays a critical role in ensuring the efficiency and performance of the turbine. The outer ring of the stationary blade is particularly challenging due to its large diameter, high number of grooves, thin wall thickness, and low rigidity, which make it prone to deformation during machining. Moreover, maintaining precise dimensional accuracy and groove geometry is crucial for the overall quality and reliability of the component.
This paper addresses the challenges associated with machining the outer ring of the stationary blade. By analyzing the specific characteristics of the component and the practical issues encountered during groove processing, we propose an improved machining strategy. This includes optimizing the machining plan, enhancing the tool holder design, and testing new cutting tools to significantly improve both the accuracy and quality of the final product.
**1. Determination of the Preliminary Machining Plan**
Figure 1 shows the line drawing of the outer ring groove of the stationary blade. As illustrated, strict tolerance control is required for dimensions h1 and b2, which are critical to the structural integrity and performance of the component.
*Figure 1*
Based on the product design and manufacturing specifications, engineers selected a beam-moving gantry-type five-axis CNC machining center (as shown in Figure 2) and a self-designed special milling machine (shown in Figure 3) for the machining of the stator blade's outer ring grooves.
After detailed discussions and evaluations, the initial machining plan was established as follows:
- Pre-milling straight grooves using a wave-edged carbide end mill
- Rough milling the root groove profile with a high-speed steel forming cutter
- Finishing the root groove dimensions with a carbide end mill
- Final finishing of the root groove profile using a high-speed steel forming cutter (as shown in Figure 4)
