Blade straightening machine tool and its control system and method

Abstract

The invention discloses a blade shape correcting machine tool. The blade shape correcting machine tool comprises a machine tool body, a machine tool head, a tailstock, a portal frame and a hydraulic head. The machine tool head is a rotating shaft A and used for clamping one end of a blade and providing rotating torsional moment for correcting torsion and deformation. The tailstock is located on the machine tool body and opposite to the machine tool head, can slide on the machine tool body forwards and backwards and is used for clamping the other end of the blade and making the blade fixed to the machine tool body. Blades with different lengths can be clamped by adjusting the front-and-back position of the tailstock, and torsion and deformation can be corrected by rotating the shaft A. The hydraulic head is a lifting moving shaft Z and provides downward pressure for correcting torsion and deformation. The hydraulic head is arranged on the portal frame through a sliding rail, and a left moving shaft Y and a right moving shaft Y are arranged and used for adjusting the position, in the width direction of the blade, of the hydraulic head. The portal frame is matched with a guide rail of the machine tool body, and a front moving shaft X and a back moving shaft X are arranged and used for adjusting the position, in the length direction of the blade, of the hydraulic head. The point of strength, on the blade, of the hydraulic head can be pinpointed by linking the shafts Y with the shafts X, and bending and deformation can be corrected by downwards moving the shaft Z. A PID control method is adopted for a control system of the machine tool, deformation can be corrected to meet requirements within at most three cycles, and shape correcting efficiency of the blade is greatly improved.

Description

Technical field: [0001] The invention belongs to the technical field of blade manufacturing, and relates to a blade straightening machine tool and its control system and method, which are used for correcting the bending deformation and twisting deformation of blades. Background technique: [0002] In the steam turbine manufacturing industry, the blade is the workpiece with the most technical difficulty and the largest processing batch. The manufacturing cycle of the steam turbine often depends on the processing efficiency of the blade. [0003] During the processing of the blade, it is easy to cause bending deformation and twisting deformation due to the release of internal energy to reduce the stress, and it needs to be corrected. [0004] At present, blade correction is done manually, relying entirely on the experience of the master workers. Usually, it takes multiple rounds of corrections to correct the deformation within the allowable range. For some large blades, such a...

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Problems solved by technology

[0004] At present, blade correction is done manually, relying entirely on the experience of the master workers. Usually, it takes multiple rounds of corrections to correct the deformation within the allowable range. For some large blades, such as the final stage blades of nuclear power steam turbines, the The length is 72 inches (1.83m), the blank weighs more than half a ton, the deformation will be large, and the number of back and forth corrections is as high as ten times

[0005] Manual orthopedics requires high personal skills of workers, high labor intensity, very low orthopedic efficiency, and can only be corrected for bending, but not for twisting, which has become an urgent problem to be solved in the steam turbine manufacturing industry

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