A Steam Turbine Blade Positioning and Clamping System for Steam Channel Processing

Abstract

The invention provides a steam turbine blade positioning and clamping system used for machining a steam passage. The steam turbine blade positioning and clamping system comprises a blade root clamp and a blade crown clamp which are used for clamping the two ends of each blade and connected to a machine tool. The blade crown clamp comprises a clamp body, a clamping device and an energy accumulator, the clamping device comprises a spring supporting oil cylinder, a supporting rod and an oil route block oil cylinder, wherein the spring supporting oil cylinder, the supporting rod and the oil route block oil cylinder are sequentially arranged on the upper surface of a clamp body in the vertical direction, the piston end of the spring supporting oil cylinder is arranged corresponding to the lower surface of the blade crown portion, the bottom of the supporting rod is connected to the clamp body, the top of the supporting rod is hinged to the middle of a clamping arm, the piston end of the oil route block oil cylinder is hinged to the tail end of the clamping arm, and the front end of the clamping arm is arranged corresponding to the upper surface of the blade crown portion. After the piston end of the spring supporting oil cylinder and the piston end of the oil route block oil cylinder move in place, the energy accumulator keeps oil pressure state of the piston end of the spring supporting oil cylinder and the piston end of the oil route block oil cylinder. The steam turbine blade positioning and clamping system can reduce labor intensity of operating personnel and lower operation difficulty, deformation, caused by the clamps, of the blades is effectively avoided, machining efficiency is greatly improved, and machining quality is effectively controlled.

Description

Technical field [0001] The invention relates to the field of steam turbine blade manufacturing, in particular to a steam turbine blade positioning and clamping system for steam passage processing. Background technique [0002] For steam path processing of steam turbine blades, traditional clamps are generally used to clamp the root and crown of the blade on the machine tool. However, in the process of using machine tools to process the blade steam passage, the following problems are prone to occur: 1. The blade and the bending deformation of the blade due to the pressure stress of the blade tip and the long steam passage profile and weak steam edge (about 0.8 thickness) lead to processing. Easy to tremble and other problems; 2. The traditional processing mode causes the blades to be easily deformed during the processing and the efficiency is low (the clamping causes the blade processing to tremble, so you can’t eat the knife); 3. After the blade root is clamped, the blade crown ...

AI Technical Summary

Problems solved by technology

However, in the process of using machine tools to process the steam channel of the blade, the following problems are prone to occur: 1. The blade is bent and deformed due to the compressive stress at the tip of the blade, and the profile of the steam channel is long and the steam outlet edge is weak (thickness is about 0.8). Easy to tremble and other problems; 2. The traditional processing mode causes the blade to be easily deformed during the processing and the efficiency is low (clamping causes the blade to tremble during processing, so it is not possible to eat too much); 3. After the blade root is clamped, the blade crown In the free state, in order to ensure that the deformation of the workpiece is small when clamping, the operator must clamp the workpiece by manual shims, etc., which is labor-intensive (the blade processing time is 8 hours, and the clamping time is 3 hours), and the operation more difficult

Especially when processing low-pressure blades, because the length of the low-pressure blade is very large relative to its radial dimension, for example, the length of a 47-inch low-pressure blade is 1200mm, so the processing is more difficult, and the above problems are more serious

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