Machining method for front cylinder of turbine

Abstract

The invention discloses a machining method for a front cylinder of a turbine, and relates to the field of machining, in particular to the machining method for the front cylinder of the turbine. The machining method comprises the following steps that the nozzle surface and large surface of a workpiece are roughly turned with a 90-degree indexable turning tool, and a finish turning allowance of 0.3 mm is preserved; a nozzle channel is roughly turned with a super-hard high-speed steel cutter, and a finish turning machining allowance of 0.3 mm is preserved; an inner and outer arc T-shaped channel is roughly turned with a super-hard high-speed steel hook knife, and a fine turning machining allowance of 0.1 mm is preserved; a front steam-sealing circle and a nozzle circle are roughly turned with a 75-degree indexable turning tool, and a fine turning machining allowance of 1 mm is preserved; a front steam-sealing channel is roughly turned with the super-hard high-speed steel cutter; the outer circle of the workpiece is roughly turned with the 75-degree indexable turning tool; the workpiece and a partition slot are roughly machined with a super-hard high-speed alloy tool; and fine turning is performed, and the workpiece is finely turned to a required dimension with the super-hard high-speed alloy tool on a machine tool. The machining method is simple in machining process; the production efficiency and the product qualification rate can be effectively improved; and influence of vibration on the workpiece machining precision during a machining process can be avoided.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to a processing method for a front cylinder of a steam turbine. Background technique [0002] The partition groove of the front cylinder is located in the middle of the front cylinder. The workpiece includes the rear steam seal circle and the partition groove. The vertical lathe needs to process this partition groove. Due to the large size drop, it is obviously impossible to realize it according to the ordinary processing method. The processing of the partition groove is difficult. processing, and its tolerance requirements; due to the large shape of the workpiece and the small space at both ends, while the size of the middle partition plate is large, a special transverse cutter bar should be installed in the middle of the processing, which further increases the difficulty of cutting and is prone to cutting vibration. The processing efficiency is low. Contents of the invention...

AI Technical Summary

Problems solved by technology

[0002] The partition groove of the front cylinder is located in the middle of the front cylinder. The workpiece includes the rear steam seal circle and the partition groove. The vertical lathe needs to process this partition groove. Due to the large size difference, it is obviously impossible to realize it according to the ordinary processing method. The difficult point of processing the partition groove processing, and its tolerance requirements; due to the large shape of the workpiece and the small space at both ends, while the size of the middle partition plate is large, a special transverse cutter bar should be installed in the middle of the processing, which further increases the difficulty of cutting and is prone to cutting vibration. Low processing efficiency