CN111496479B

CN111496479B - Machining method for bottom ring of large hydroelectric generating set

Info

Publication number: CN111496479B
Application number: CN202010353200.0A
Authority: CN
Inventors: 葛军; 陶星明; 李伟刚; 黄海玉; 霍金平; 杨思晋; 李鑫; 李革; 吕义安; 李吉平; 王子林; 郭智全
Original assignee: Harbin Electric Machinery Co Ltd
Current assignee: Harbin Electric Machinery Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2021-09-24
Anticipated expiration: 2040-04-29
Also published as: CN111496479A

Abstract

The invention discloses a method for processing a bottom ring of a large hydroelectric generating set. Every two 1/4 petal bottom rings with unprocessed split surfaces are symmetrically fixed on a machine tool chuck along the circumferential direction, and the processing of the installation parts of a wear-resistant plate and a leakage-stopping ring on the bottom ring is completed; four 1/4 flap bottom rings are respectively assembled and welded with a leakage-stopping ring and a wear-resisting plate; and marking a processing circle line and a split surface processing line, milling the split surface, and rounding the four 1/4 split bottom ring groups to finish processing. The invention has the characteristics of short manufacturing period, high efficiency, low cost, easy popularization and strong universality.

Description

Machining method for bottom ring of large hydroelectric generating set

Technical Field

The invention relates to a method for machining parts in the field of machinery, in particular to a method for machining a bottom ring of a large hydroelectric generating set.

Background

The bottom ring is the most critical part in the water distributor of the hydroelectric generating set and is also one of the important parts of the runner of the water turbine. In order to avoid long-term erosion corrosion of water flow, a wear plate and a leakage-stopping ring which are made of stainless steel materials are respectively welded on the upper plane and the inner circle of the bottom ring; for the convenience of transportation, the bottom ring of a large-scale unit is usually of a circular ring structure with four petals circumferentially.

At present, after a bottom ring is milled on a split surface, the processing of an inner circle and a plane assembled with a leakage-stopping ring and a plane assembled with a wear-resistant plate is completed under a circle assembling state, the leakage-stopping ring and the wear-resistant plate are assembled and welded in a split mode, because a welding seam between the leakage-stopping ring and the wear-resistant plate on the split surface of the bottom ring and between the wear-resistant plate and the bottom ring protrudes out of the split surface of the bottom ring, the deformation of the bottom ring can be caused by welding the leakage-stopping ring and the wear-resistant plate, and after the leakage-stopping ring and the wear-resistant plate are welded, the split surface of the bottom ring needs to be repaired and milled to form a whole circle for continuous processing; if the welding deformation is too large, the machining amount of the split surface of the bottom ring is insufficient, and the split surface needs to be subjected to repair welding and milling.

In order to avoid the generation of secondary repair-milling bottom ring split surfaces when the anti-leakage ring and the wear plate are welded, the method for machining the bottom ring of the large hydroelectric generating set is easy to popularize, strong in universality, high in efficiency and low in cost.

Disclosure of Invention

The invention aims to provide a method for machining a bottom ring of a large hydroelectric generating set, which is easy to popularize, strong in universality, high in efficiency and low in cost, and particularly aims at machining the bottom ring of the large hydroelectric generating set with a welded leakage-stopping ring and a wear-resistant plate divided into 4-piece circular ring structures. The technical scheme of the invention is as follows:

1) symmetrically fixing a first 1/4 flap bottom ring and a second 1/4 flap bottom ring which are not machined on split surfaces on a vertical lathe chuck along the circumferential direction, and machining a wear plate mounting surface, a leakage-stopping ring mounting plane and a leakage-stopping ring mounting circle;

2) symmetrically fixing a third 1/4 flap bottom ring and a fourth 1/4 flap bottom ring which are not machined on split surfaces on a vertical lathe chuck along the circumferential direction, and machining a wear plate mounting surface, a leakage-stopping ring mounting plane and a leakage-stopping ring mounting circle;

3) assembling and welding 1/4 petal leak-stopping rings and 1/4 petal wear-resisting plates on a first 1/4 petal bottom ring, a second 1/4 petal bottom ring, a third 1/4 petal bottom ring and a fourth 1/4 petal bottom ring respectively;

4) drawing a processing round line and a processing line of the split surface;

5) milling a valving surface, forming a full circle by a first 1/4 valving bottom ring, a second 1/4 valving bottom ring, a third 1/4 valving bottom ring and a fourth 1/4 valving bottom ring, and processing the full circle bottom ring with a welded leakage-stopping ring and a wear-resisting plate.

The invention has the technical effects that:

1. the invention processes the leak-proof ring, the wearing plate mounting part, the welding leak-proof ring and the wearing plate under the condition that the split surface is not processed into a non-group circle, thereby avoiding finishing the processing, welding leak-proof ring and wearing plate of the parts under the condition that the split surface is processed into a group circle, generating the secondary milling of the split surface, saving the manufacturing period, improving the efficiency and having low cost.

2. The invention can avoid the problem of repair welding repair of the split surface caused by insufficient processing amount of the split surface due to overlarge welding deformation.

3. The method is novel in concept, is particularly suitable for processing the bottom ring of the large hydroelectric generating set, can be popularized and applied to manufacturing the ring piece which is split and has a welding and paving structure in the processing process, and is easy to popularize and high in universality.

Drawings

FIG. 1 is a top view of a bottom ring of a first and second ring halves before a leak-stopping ring and a wear plate are welded

FIG. 2 is a top view of a bottom ring of a third and a fourth ring before a stop-leak ring and a wear plate are welded

FIG. 3 is a top view of 1/4 flap bottom ring after installing and welding a leak-stopping ring and a wear plate

FIG. 4 is a sectional view of the back bottom ring A-A of the wear-resistant plate and the leak-stopping ring

FIG. 5 is a sectional view of a B-B split surface of a back bottom ring of a wear-resistant ring and a wear-resistant plate

FIG. 6 is a C-C sectional view of the split surface of the back bottom ring of the wear-resistant ring and the wear-resistant plate

Detailed Description

As shown in fig. 1 to 6: a processing method of a bottom ring of a large hydroelectric generating set is particularly directed to a processing method of a bottom ring of a large hydroelectric generating set with a welded leakage-stopping ring and a wear-resisting plate divided into 4-piece circular ring structure. The technical scheme of the invention is as follows:

1) a first 1/4 flap bottom ring 1 and a second 1/4 flap bottom ring 2 which are not machined on split surfaces are symmetrically fixed on a vertical lathe chuck along the circumferential direction, and a wear plate mounting surface 3, a leakage stopping ring mounting plane 4 and a leakage stopping ring mounting circle 5 are machined;

2) a third 1/4 flap bottom ring 6 and a fourth 1/4 flap bottom ring 7 which are not machined on split surfaces are symmetrically fixed on a vertical lathe chuck along the circumferential direction, and a wear plate mounting surface 3, a leakage stopping ring mounting plane 4 and a leakage stopping ring mounting circle 5 are machined;

3) assembling and welding 1/4 petal leak-

stopping rings

8 and 1/4 petal wear-resisting plates 9 on a first 1/4 petal base ring 1, a second 1/4 petal base ring 2, a third 1/4 petal base ring 6 and a fourth 1/4 petal base ring 7 respectively;

4) drawing a processing round line and a processing line of the split surface;

5) milling a split surface, forming a full circle by a first 1/4 petal bottom ring 1, a second 1/4 petal bottom ring 2, a third 1/4 petal bottom ring 6 and a fourth 1/4 petal bottom ring 7, and processing the full circle bottom ring after welding a leakage-stopping ring 8 and a wear-resisting plate 9.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A processing method of a bottom ring of a large hydroelectric generating set is characterized by comprising the following steps: the method comprises the following steps:

1) a first 1/4 flap bottom ring (1) and a second 1/4 flap bottom ring (2) with unprocessed split surfaces are symmetrically fixed on a vertical lathe chuck along the circumferential direction, and a wear plate mounting surface (3), a leakage-stopping ring mounting plane (4) and a leakage-stopping ring mounting circle (5) are processed;

2) a third 1/4 flap bottom ring (6) and a fourth 1/4 flap bottom ring (7) which are not machined on split surfaces are symmetrically fixed on a vertical lathe chuck along the circumferential direction, and a wear plate mounting surface (3), a leakage-stopping ring mounting plane (4) and a leakage-stopping ring mounting circle (5) are machined;

3) a 1/4-petal leakage-stopping ring (8) and a 1/4-petal wear-resisting plate (9) are respectively assembled and welded on a first 1/4-petal bottom ring (1), a second 1/4-petal bottom ring (2), a third 1/4-petal bottom ring (6) and a fourth 1/4-petal bottom ring (7);

4) drawing a processing round line and a processing line of the split surface;

5) milling a valving surface, forming a complete circle by a first 1/4 valving bottom ring (1), a second 1/4 valving bottom ring (2), a third 1/4 valving bottom ring (6) and a fourth 1/4 valving bottom ring (7), and processing the complete circle after welding a leakage-stopping ring (8) and a wear-resisting plate (9).