Research on adaptive CNC machining arithmetic and process for near-net-shaped jet engine blade

2021

Preprint

Self Cite

This study proposes an adaptive CNC machining process based on on-machine measurement to control the machining error of near-net-shaped blades. The multi-source and multi-process machining error transmission model of a near-net-shaped blade is established, and the reduction effect of the machining error transmission chain by the adaptive CNC machining process is qualitatively analyzed based on the machining error transmission flow model. The effects of the adaptive CNC machining process on the positioning benchmark error, machining position error, and machining contouring error are explored based on an experiment for the adaptive CNC machining process. In particular, the ability of the adaptive CNC machining process to cooperatively control the blade position error and the contouring error is discussed in relation to the stiffness of the blade-fixture system. The results show that the adaptive CNC machining process can reasonably reduce the machining errors caused by the positioning benchmark. The final deviation band of the blade body is reduced by 60% based on this adaptive CNC machining process. The adaptive CNC machining process can optimize the contouring error and the position error of the blade tenon root with only the stiffness of the blade-fixture system prerequisite being ensured. The adaptive CNC machining process has the excellent ability to control machining errors to improve the machining quality of the blade.

Section: Adaptive Cnc Machining Process and The Blade Tenon Root Machining Position Errormentioning

confidence: 99%

Research on Machining Errors Control by Adaptive CNC Machining Process for Near-Net-Shaped Jet Engine Blades

2021

Preprint

Self Cite

“…Many scholars tried to solve this problem by traditonal point cloud registration method. Wu et al 13 measured the blade airfoil surface by a probe and the measuring points are preprocessed. The blade model surface was discretized, and the PCA (Principle Component Analysis) method was used to analyze the main direction of the measurement point cloud and the model point cloud to complete the rough registration.…”

Section: Introductionmentioning

confidence: 99%

Calibration and error compensation of scanner-based robotic belt grinding system

Jiang

Zhou

Advances in Mechanical Engineering

2022

Turbine blade is one of the key components of turbomachinery, and the machining quality of its airfoil surface has an important impact on the operating efficiency, service life, and safety of the turbine. Robotic abrasive belt grinding has become an important means of blade airfoil surface machining. Based on the self-developed robot grinding system, this paper proposes a scanner-based system calibration method to determine the relationships among coordinate systems of measurement, robot base, tool, and workpiece. An accurate and efficent calibration method of workpiece coordinate system based on rapid surface segmentation of point cloud using CAD model is established. An blade error surface is constructed by B-spline interpolation to compensate system errors such as absolute positioning error of robot, calibration error, and blade shape error. The calibration process is illustrated at the end of this paper. The effectiveness of the calibration and error compensation methods proposed in this paper are verified by the simulation results.

“…In the CNC machining process of the blade LTE, tenon root and tip, the positioning and clamping part is only the blade body, which is a complex surface part. At present, the CNC machining process method for this kind of blade tenon root and tip is a low melting point alloy casting process, and a certain ratio of low melting point alloy, such as tin-bismuth alloy, is used to pour the blade body as a block to improve the stiffness of the blade-fixture system, and the machining accuracy is ensured by benchmark conversion [2]. However, due to the use of low melting point alloy, this method results in environmental pollution and low processing efficiency, and the benchmark conversion leads to low machining accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…process on the position error of the tenon root during the tenon root CNC machining process, and the position error refers to the position of the machining blade tenon root relative to the blade body, which mainly includes the circular position error and the twist position error. The fixture is a special fixture for the tenon root CNC machining process based on a multi-body rigid-flexible coupling dynamic model design[2].…”

mentioning

confidence: 99%

Research on machining error transmission mechanism and compensation method for near-net-shaped jet engine blades CNC machining process

Int J Adv Manuf Technol

Yu³

2021

Self Cite

This study proposes an adaptive CNC machining process based on onmachine measurement to control the machining error of near-net-shaped blades. The multi-source and multi-process machining error transmission model of a near-netshaped blade is established, and the reduction effect of the machining error transmission chain by the adaptive CNC machining process is qualitatively analyzed based on the machining error transmission flow model. The effects of the adaptive CNC machining process on the positioning benchmark error, machining position error, and machining contouring error are explored based on an experiment for the adaptive CNC machining process. In particular, the ability of the adaptive CNC machining process to cooperatively control the blade position error and the contouring error is discussed in relation to the stiffness of the blade-fixture system. The results show that the adaptive CNC machining process can reasonably reduce the machining errors caused by the positioning benchmark. The final deviation band of the blade body is reduced by 60% based on this adaptive CNC machining process. The adaptive CNC machining process can optimize the contouring error and the position error of the blade tenon root with only the stiffness of the blade-fixture system prerequisite being ensured. The adaptive CNC machining process has the excellent ability to control machining errors to improve the machining quality of the blade.