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Accurate rounding method of large-diameter metal cylinder body

A metal cylinder and large-diameter technology, which is applied in the field of precise rounding of large-diameter metal cylinders, can solve the problems of large technical equipment of the rounding device, troublesome, and inability to eliminate the stress in the calibration cylinder, so as to reduce frictional resistance. Effect

Active Publication Date: 2012-07-18
云南大为化工装备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned existing circle calibration methods all belong to the mechanical circle calibration method using external force, which is feasible for cylinders with low precision requirements, but cannot be adapted to cylinders with high precision requirements.
For cylinders with thick walls, the process equipment of the circle calibration device is large and complicated due to the thick wall of the cylinder. The manufacture of these process equipment is not only time-consuming, troublesome, expensive, and even impossible to implement, the accuracy of the circle calibration It is also difficult to guarantee, and the internal stress generated by the calibration cylinder cannot be eliminated, which will affect the assembly, welding and subsequent processing of the cylinder

Method used

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  • Accurate rounding method of large-diameter metal cylinder body
  • Accurate rounding method of large-diameter metal cylinder body
  • Accurate rounding method of large-diameter metal cylinder body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Specifications: The inner diameter of the cylinder is 4000mm, the thickness of the cylinder is 30mm, the length of the cylinder is 2500mm, and the material is Q345R.

[0043] Accuracy requirements: cylinder roundness is not greater than 1.5mm.

[0044] Make the school circle mold 10:

[0045] Structural selection of the rounding mold 10: Since the inner diameter of the cylinder is 4000mm and the wall thickness is 30mm, in order to prevent the deformation of the cylinder after rounding and the deformation in the butt welding of the cylinder and the cylinder, the rounding mold 10 The structure of the integral round-shaped mold is adopted. Its production method is as follows:

[0046] 1) Preliminary calculation according to the formula 〖1〗: the distance between the rounding molds is A=2425mm~3180mm, so the number of cylinder rounding molds 10 is 2 pieces;

[0047] 2) Making the coaming 1: Since the material of the rounded cylinder is Q345R, which belongs to carbon alloy...

Embodiment 2

[0070] Specifications: The inner diameter of the cylinder is 4000mm, the thickness of the cylinder is 40mm, the length of the cylinder is 2500mm, and the material is Q345R.

[0071] Accuracy requirements: cylinder roundness is not greater than 1.5mm.

[0072] The production of circle-correcting mold 10: due to the wall thickness 40mm of cylinder 12 being circled, only differs from the wall thickness 30mm of cylinder 12 of embodiment 1 by 10mm. The production, assembly welding, stress relief treatment and mechanical processing are completely the same as those in Example 1. According to the strength calculation, the rigidity of the circle-calibrating mold 10 fully meets the cylinder body 12 circle-calibrating requirements. .

[0073] The assembly welding and stress relief treatment of the round tire set are the same as in Embodiment 1.

[0074] Manufacture of cylinder 12: According to the design requirements, the inner diameter of the cylinder is 4000mm, the thickness of the c...

Embodiment 3

[0078] Specifications: The inner diameter of the cylinder is 4000mm, the thickness of the cylinder is 50mm, the length of the cylinder is 2500mm, and the material is Q345R.

[0079] Accuracy requirements: cylinder roundness is not greater than 1.5mm.

[0080] Make the school circle mold 10:

[0081] Structural selection of the rounding mold 10: Since the inner diameter of the cylinder is 4000mm and the wall thickness is 50mm, in order to prevent the deformation of the cylinder after rounding and the deformation during the butt welding of the cylinder and the cylinder, the rounding mold 10 The structure of the integral round-shaped mold is adopted. See figure 1 , which is made as follows:

[0082] 1) Preliminary calculation according to the formula (1): the distance A between the rounding molds is between 2425 and 3180 mm, so the number of cylinder rounding molds 10 is 2 pieces;

[0083] 2) Making the coaming 1: Since the material of the rounded cylinder is Q345R, which is ...

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Abstract

The invention relates to an accurate rounding method of a large-diameter metal cylinder body, which comprises the steps of: manufacturing rounding moulds in advance according to the requirements for the sizes and the precisions of a cylinder body by using physical characteristics of heat expansion and cold contraction of a metal material, connecting the rounding moulds by using a distance rod with threads at two ends to form a rounding mould set; and placing the cylinder body to be rounded on a support platform of a heating furnace (or thermal treatment furnace), then placing in the heating furnace (or thermal treatment furnace) for heating, heating to reach the final heating temperature, then taking the cylinder body out, loading in the rounding mould set, slowly cooling, when the cylinder body is cooled to the room temperature, ensuring that the inner surface of the cylinder body and the outer surface of the rounding mould are naturally jointed and the cylinder body can reach the required roundness. Compared with the traditional mechanical strength rounding method of the cylinder body, the accurate rounding method has remarkable advantages of high rounding precision and less residual stress after rounding, can be used for accurate rounding in the process of machining the large-diameter metal cylinder body, especially accurate rounding of the large-diameter metal cylinder body and a large-diameter rotary metal cylinder body with high strength and large wall thickness.

Description

technical field [0001] The invention relates to a method for precise circle calibration of large-diameter metal cylinders, which is used for precise circle calibration during the processing of large-diameter metal cylinders, especially large-diameter metal cylinders and large-diameter rotating metal cylinders with high strength and large wall thickness The precise calibration of the body. It can be widely used in the manufacture of large-diameter metal cylinders of large-scale metal pipes, pressure vessels, and dryers in petroleum, chemical, building materials, electric power, and water conservancy industries. Background technique [0002] Due to the large diameter of the large-diameter metal cylinder, the diameter is generally 3000mm-8000mm, and the wall thickness is 20mm-200mm. Due to the constraints of processing and forming equipment capabilities and processing costs, most of the metal plates are spliced ​​according to the required size, rolled and welded by a plate rol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D1/08
Inventor 翁宇李安荣
Owner 云南大为化工装备制造有限公司
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