Machining Method of Slender Blind Hole on Cylinder Block of 100KW High Voltage Nuclear Power Steam Turbine

Abstract

The invention discloses a machining method for long and thin blind holes in a 100 kW high-voltage nuclear turbine cylinder body. A locating control tool is used. A straight hole is machined in the cylinder body, the included angle between the straight hole and a horizontal plane is 20 degrees, and the included angle between the straight hole and a vertical face is 0 degree. A space angle hole is machined in the cylinder body, the included angle between the space angle hole and the horizontal plane is 20 degrees, and the included angle between the space angle hole and the vertical face is 5 degrees. The method comprises the steps that the tool is located; first time clamping locating of the tool is carried out; the straight hole is drilled through a boring rod; a working bench rotates 5 degrees relative to a rotating center of the working bench in a horizontal plane, the space angle hole is drilled; second time clamping locating of the tool is carried out; and a straight hole and a space angle hole which are symmetrical with the straight hole and the space angle hole are drilled. The centers of the rotating working bench, the tool and a workpiece coincide, and through whole rotation when the method is used on a boring mill, position accuracy of each long and thin blind hole can be guaranteed.

Description

technical field [0001] The invention relates to a machining method for nuclear power equipment, in particular to a machining method for elongated blind holes on cylinder blocks of 100 kilowatt high-voltage nuclear power steam turbines. Background technique [0002] The structure of the cylinder block of a 100 kW high-voltage nuclear power steam turbine is as follows Figure 1 to Figure 3 As shown, the external dimensions of the cylinder body are 6000×5110×4960, and there are two Φ150 straight holes and two Φ200 space angle holes on both sides of the bottom of the cylinder body (there are eight slender blind holes in the whole cylinder body) , where the angle between the Φ150 straight hole and the horizontal plane is 20°, and the angle between the vertical plane and the vertical plane is 0°; the angle between the Φ200 space angle hole and the horizontal plane is 20°, and the angle between the vertical plane and the The included angle is 5°. [0003] Since the ratio of the le...

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Problems solved by technology

[0003] Since the ratio of the length to diameter of the eight slender blind holes on the cylinder body is relatively large (respectively Φ200×1512, Φ200×1327, Φ150×1512, Φ150×1327), they are all greater than 6 times, and each slender blind hole The holes have a certain spatial angle, so the processing of slender blind holes is difficult, and the processing accuracy cannot be guaranteed

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