CN108723707B

CN108723707B - Manufacturing method of skirt foundation ring plate

Info

Publication number: CN108723707B
Application number: CN201810401049.6A
Authority: CN
Inventors: 袁承春
Original assignee: Harbin Boiler Co Ltd
Current assignee: Harbin Boiler Co Ltd
Priority date: 2018-04-28
Filing date: 2018-04-28
Publication date: 2020-04-17
Anticipated expiration: 2038-04-28
Also published as: CN108723707A

Abstract

The invention provides a manufacturing method of a skirt foundation ring plate. Under the condition of meeting and using requirements, the traditional method for assembling and drilling circular holes on the U-shaped notch of the skirt foundation of the pressure container in a stacking mode and grinding non-circular hole areas of the U-shaped notch by gas cutting is optimized and innovated, and the advanced manufacturing method for assembling and drilling circular holes on the template in a stacking mode by adopting a U-shaped notch numerical control gas cutting surface design structure, adopting numerical control gas cutting forming and drilling and processing the circular holes on the foundation ring plate, the anchor plate and the template by taking the circular arc of the U-shaped notch as a reference is invented. Reduce the manufacturing cost, improve the production efficiency and the product quality.

Description

Manufacturing method of skirt foundation ring plate

Technical Field

The invention relates to the field of pressure containers, in particular to a method for manufacturing a skirt foundation ring plate.

Background

For a long time, U-shaped notches are uniformly distributed on a skirt base annular plate of a vertical or tower type pressure vessel and used for installing base bolts, the diameter range of the inner circle and the outer circle of the base annular plate is 1000-5000 mm, the plate thickness is 10-60 mm, and the design of the U-shaped notches requires that the mechanical processing surface roughness, the length is 40-200 mm, and the width is 20-100 mm; after the basic ring plate is spliced in sections, the basic ring plate is overlapped with an anchor plate and a template for a basic bolt, and is provided with a hole scribing line and a matched drilling round hole; and the residual part of the U-shaped notch is removed by machining or gas cutting and grinding, so that the gas cutting surfaces have uneven intervals, inclined end surfaces, uneven surfaces and difficult grinding, the requirement on the roughness of the U-shaped notch of the skirt base annular plate of the pressure container is over high, the manufacturing cost is high, the surface quality is poor, and the design structure and the manufacturing technology are lagged behind.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and further provides a manufacturing method of a skirt foundation ring plate, which effectively solves the problems of laggard design structure and manufacturing technical method, high manufacturing cost and poor product quality of the traditional skirt foundation ring plate U-shaped notch.

The purpose of the invention is realized by the following technical scheme:

a, blanking a base ring plate 1 in a whole plate manner, and cutting a U-shaped notch by one-time numerical control gas, wherein the inner side of the U-shaped notch is a circular hole area for drilling, the outer side of the U-shaped notch is a non-circular hole area, and the diameter of an inner circular arc of a U-shaped notch 2 is 60 mm; b. concentrically stacking the foundation ring plate 1 with the cut U-shaped notch, the anchor plate and the template, and stacking the gas-cut foundation ring plate at the top; c. taking the center of the arc on the inner side of the U-shaped notch as a standard, adopting a phi 60 drill to penetrate through the U-shaped notch, and drilling the center of a phi 56 round hole on the anchor plate or template below the U-shaped notch and scoring the pit; d. drilling a phi 56 round hole, and then disassembling and assembling the stacked plates.

And step a, blanking the basic ring plate in sections, cutting a U-shaped notch at one time during blanking, cutting a splicing groove for welding at each divided section, ensuring the tolerance of the shape and position dimensions of the U-shaped notch through lofting during splicing, and welding the divided sections into a complete annular basic ring plate.

The invention has the beneficial effects that: by adopting the technical scheme of the invention, the product quality is obviously improved, and the manufacturing cost is obviously reduced. The technology is novel, practical, advanced and reliable; the design structure and the manufacturing technology are optimized, the manufacturing cost of a scribing line, drilling of the basic ring plate, gas cutting and grinding and the like is saved, the quality of a U-shaped notch is obviously improved, the process is more advanced and reasonable, the production efficiency is improved by about 1/4, and the skirt basic ring plate is suitable for design and manufacturing enterprises of pressure-bearing equipment such as pressure vessels, nuclear energy equipment and the like.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is an enlarged schematic view of the U-shaped notch of the present invention.

Detailed Description

The invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 and fig. 2, the method for manufacturing a skirt foundation ring plate according to the present embodiment includes steps of a, blanking a foundation ring plate 1 in a full-page manner, and performing one-time numerical control gas cutting to form a U-shaped notch 2, wherein the inner side of the U-shaped notch 2 is a circular hole area 4 for drilling, the outer side is a non-circular hole area 5, and the inner circular arc diameter of the U-shaped notch 2 is 60 mm; b. the basic ring plate 1 with the cut U-shaped gap 2, the anchor plate and the template are concentrically stacked, and the gas-cut basic ring plate 1 is stacked on the top; c. taking the center of the arc on the inner side of the U-shaped notch as a standard, adopting a phi 60 drill to penetrate through the U-shaped notch, and drilling the center of a phi 56 round hole on the anchor plate or template below the U-shaped notch and scoring the pit; d. and drilling a phi 56 round hole in alignment with the position of the pit, and then disassembling and stacking the plates to ensure that the drilled holes of the plates correspond to each other.

In the step a, the basic ring plate 1 is blanked in sections of 1/4, a U-shaped notch 2 is cut out in one-time numerical control gas cutting during blanking, a splicing groove 6 for welding is also cut in each divided section, the tolerance of the shape and position size of the U-shaped notch 2 is guaranteed through lofting during splicing, and the divided sections are welded into the complete annular basic ring plate 1.

All the sectional welding lines are uniformly distributed along the circumference of the annular plate.

The diameter tolerance of the circular arc center circle of the U-shaped notch 2 and the tolerance of the circular arc center distance of the adjacent U-shaped notches 2 to (-2, + 2) are eliminated; or the distance between the centers of the adjacent U-shaped notches 2 can be properly enlarged to (-3, + 3) because the invention adopts the basic annular plate 1 to automatically gas cut the U-shaped notch, the diameter of the inner circular arc is 60mm, and the U-shaped notch is used for being matched and installed with the anchor plate and the template with the round hole phi 56, and the matched drilling is carried out by taking the circular arc of the U-shaped notch which is digitally controlled and gas cut by the basic annular plate 1 as the reference.

The surface roughness of the U-shaped notch 2 is optimized to be a numerical control gas cutting surface 3, the U-shaped notch 2 is subjected to gas cutting forming at one time during blanking by adopting numerical control gas cutting, and the surface is smoother and smoother compared with a manually cut surface;

lofting inspection is carried out when the ring plates of all sections are spliced, and the diameter tolerance of the circular arc center circle of the U-shaped notch 2 and the tolerance of the circular arc center distance of the adjacent U-shaped notches 2 are ensured;

and drilling the circular holes of the foundation bolts of the stacked parts by taking the circular arc after numerical control gas cutting as a reference.

The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A, blanking a base ring plate (1) in a whole plate mode, and cutting a U-shaped notch (2) through one-time numerical control gas, wherein the inner side of the U-shaped notch (2) is a circular hole area (4) for drilling, the outer side of the U-shaped notch is a non-circular hole area (5), and the circular arc diameter of the U-shaped notch is 60 mm; b. the basic ring plate (1) with the cut U-shaped gap (2) is concentrically overlapped with the anchor plate and the template, and the gas-cut basic ring plate (1) is stacked on the top; c. taking the center of the arc on the inner side of the U-shaped notch as a standard, adopting a phi 60 drill to penetrate through the U-shaped notch, and drilling the center of a phi 56 round hole on any one of the anchor plate or the template below the skirt ring plate in a stacking manner and drilling a pit; d. drilling a phi 56 round hole, and then disassembling and assembling the stacked plates.

2. The manufacturing method of the skirt base ring plate according to claim 1, wherein in the step a, the base ring plate (1) is blanked in sections, a U-shaped notch is cut out in one-time numerical control gas cutting during blanking, a splicing groove for welding is also cut out of each divided section, and the divided sections are welded into a complete annular base ring plate by lofting to guarantee the tolerance of the shape and position dimensions of the U-shaped notch during splicing.