CN104646941A - Processing method of cylinder chamber of large turbine - Google Patents

Abstract

The invention relates to the field of machining, in particular to a processing method of a cylinder chamber of a large turbine. The method comprises the steps of marking off, drawing a processing line required by a biaxial coordinate, correcting the center of the two axial ends, and correcting and adjusting the centers of the two repeated ends to be in a same center to point out a coordinate by using X and Y digital display functions of a machine tool when a middle plane is milled by a digital control gantry; installing an angular milling head, a boring bar and a dial indicator, and overturning the center of a cylinder by taking an inner hole of a front vapor seal processed by a boring mill as a reference rotary center; using a white steel bar to paste a reference surface firmly by a three-blade cutter in such a way of taking a vertical flange surface as a reference, so as to enable the highest point of the blade to be just level to the surface of the white steel bar, and finding out the reference data of a Y axial direction; and installing the angular milling head on a ram after the references of X, Y and Z directions are aligned and a program is prepared. The method provided by the invention is simple in process, the production efficiency and processing quality can be improved, and the production cost can be saved.

Description

The processing method of large-size steam turbine cylinder chamber

Technical field

The present invention relates to field of machining, be specifically related to the processing method of large-size steam turbine cylinder chamber.

Background technology

Industrial steam turbine is as large-scale power-equipment; along with the variation with type that increases of its large-scale cylinder; work in-process can run into various problem: this research is from workshop reality; some difficult points existing for several critical process in large-scale cylinder processing and relevant difficult working position and detailed problem are inquired into: by traditional technique; when cylinder is rule; require that each several part processing line marking 3 axial coordinates of cylinder is very difficult; main cause has: 1. work piece hoisting ~ stand up difficulty, and easily steel wire rope is dragged disconnected or workpiece is touched hair; 2. part major part is without supporting place, because streak plate is large not, and cannot support school tune.

Summary of the invention

In order to solve the problem, the invention provides a kind of process simple, enhancing productivity and crudy, the processing method of the large-size steam turbine cylinder chamber saved production cost.

The processing method of large-size steam turbine cylinder chamber of the present invention, comprises the following steps:

The first step, line, finishes the processing line of two axial coordinate requirements, at axial two ends, first school goes out respective center simultaneously, when with numerical control gantry Milling Machining split, utilize X, Y digital display function of lathe by the repetition same center of central campus furnishing separately, two ends, point out coordinate;

Second step, upper angular milling head, dress boring bar and dial gauge, with the good front steam seal endoporus of Boring machine processing for the benchmark centre of gyration routs up the center of cylinder;

3rd step, with three angle of throat dishes, with vertical flange face for benchmark, pastes firm datum level with white steel bar, and dish movable knife disc, makes blade peak just concordant with white steel bar face, find out Y-axis reference data;

4th step, find accurately X, Y, Z tri-directions benchmark and after programmed, ram is loaded onto angular milling head, three suitable sword wire rod quality how much are selected according to workpiece pore size and material and allowance, angular milling head installs three sword wire rod quality, processes aperture and each end face of inner chamber by the method walking Circular test;

5th step, cutting that is thick, semifinishing inner chamber will select cutting data and cutting width according to actual conditions, surplus of putting before fine finishining, and l mm surplus is put in each shelves aperture of inner chamber, puts 0.5mm surplus to axial location end face and non-locating face with every face;

6th step, after semifinishing, measurement need be re-started to each axial end position of related features, first again with the linearity of dial gauge countercylinder center, horizontal flange, vertical flange face adjust, test one time in school, if workpiece shift, need centering X, Y, Z axis benchmark again, re-enter numerical control datum mark, test each end face of manufactured inner chamber with dial gauge again, test position be symmetry 2 on the nearly horizontal flange of axial location end face and bottom surface a bit;

7th step, adjust the position of related features of cylinder chamber end face processing, reach when beating after within drawing requirement 0.05mm, wire rod quality loaded onto by the blade renewed, fine finishining cylinder chamber, countercylinder inner chamber with milling for after Vehicle Processing good upper and lower half, to upper half-sum, second checks one by one, its dimensional tolerance, rough surface all reach the designing requirement of drawing, and detect after the upper and lower cylinder that narrows ~ put together, result shows that its position of related features is all within 0.03mm.

Process of the present invention is simple, enhances productivity and crudy, saves production cost.

Detailed description of the invention

The processing method of large-size steam turbine cylinder chamber of the present invention, is characterized in that, comprise the following steps:

The first step, line, finishes the processing line of two axial coordinate requirements, at axial two ends, first school goes out respective center simultaneously, when with numerical control gantry Milling Machining split, utilize X, Y digital display function of lathe by the repetition same center of central campus furnishing separately, two ends, point out coordinate;

Second step, upper angular milling head, dress boring bar and dial gauge, with the good front steam seal endoporus of Boring machine processing for the benchmark centre of gyration routs up the center of cylinder;

3rd step, with three angle of throat dishes, with vertical flange face for benchmark, pastes firm datum level with white steel bar, and dish movable knife disc, makes blade peak just concordant with white steel bar face, find out Y-axis reference data;

4th step, find accurately X, Y, Z tri-directions benchmark and after programmed, ram is loaded onto angular milling head, three suitable sword wire rod quality how much are selected according to workpiece pore size and material and allowance, angular milling head installs three sword wire rod quality, processes aperture and each end face of inner chamber by the method walking Circular test;

5th step, cutting that is thick, semifinishing inner chamber will select cutting data and cutting width according to actual conditions, surplus of putting before fine finishining, and l mm surplus is put in each shelves aperture of inner chamber, puts 0.5mm surplus to axial location end face and non-locating face with every face;

6th step, after semifinishing, measurement need be re-started to each axial end position of related features, first again with the linearity of dial gauge countercylinder center, horizontal flange, vertical flange face adjust, test one time in school, if workpiece shift, need centering X, Y, Z axis benchmark again, re-enter numerical control datum mark, test each end face of manufactured inner chamber with dial gauge again, test position be symmetry 2 on the nearly horizontal flange of axial location end face and bottom surface a bit;

7th step, adjust the position of related features of cylinder chamber end face processing, reach when beating after within drawing requirement 0.05mm, wire rod quality loaded onto by the blade renewed, fine finishining cylinder chamber, countercylinder inner chamber with milling for after Vehicle Processing good upper and lower half, to upper half-sum, second checks one by one, its dimensional tolerance, rough surface all reach the designing requirement of drawing, and detect after the upper and lower cylinder that narrows ~ put together, result shows that its position of related features is all within 0.03mm.

Process of the present invention is simple, enhances productivity and crudy, saves production cost.

Claims (1)

1. a processing method for large-size steam turbine cylinder chamber, is characterized in that, comprises the following steps:

The first step, line, finishes the processing line of two axial coordinate requirements, at axial two ends, first school goes out respective center simultaneously, when with numerical control gantry Milling Machining split, utilize X, Y digital display function of lathe by the repetition same center of central campus furnishing separately, two ends, point out coordinate;

Second step, upper angular milling head, dress boring bar and dial gauge, with the good front steam seal endoporus of Boring machine processing for the benchmark centre of gyration routs up the center of cylinder;

3rd step, with three angle of throat dishes, with vertical flange face for benchmark, pastes firm datum level with white steel bar, and dish movable knife disc, makes blade peak just concordant with white steel bar face, find out Y-axis reference data;

4th step, find accurately X, Y, Z tri-directions benchmark and after programmed, ram is loaded onto angular milling head, three suitable sword wire rod quality how much are selected according to workpiece pore size and material and allowance, angular milling head installs three sword wire rod quality, processes aperture and each end face of inner chamber by the method walking Circular test;

5th step, cutting that is thick, semifinishing inner chamber will select cutting data and cutting width according to actual conditions, surplus of putting before fine finishining, and l mm surplus is put in each shelves aperture of inner chamber, puts 0.5mm surplus to axial location end face and non-locating face with every face;

6th step, after semifinishing, measurement need be re-started to each axial end position of related features, first again with the linearity of dial gauge countercylinder center, horizontal flange, vertical flange face adjust, test one time in school, if workpiece shift, need centering X, Y, Z axis benchmark again, re-enter numerical control datum mark, test each end face of manufactured inner chamber with dial gauge again, test position be symmetry 2 on the nearly horizontal flange of axial location end face and bottom surface a bit;

7th step, adjust the position of related features of cylinder chamber end face processing, reach when beating after within drawing requirement 0.05mm, wire rod quality loaded onto by the blade renewed, fine finishining cylinder chamber, countercylinder inner chamber with milling for after Vehicle Processing good upper and lower half, to upper half-sum, second checks one by one, its dimensional tolerance, rough surface all reach the designing requirement of drawing, and detect after the upper and lower cylinder that narrows ~ put together, result shows that its position of related features is all within 0.03mm.