Method for designing mounted muffle for vertical bright annealing furnace

Abstract

The invention relates to a method for designing a mounted muffle for a vertical bright annealing furnace. The method is implemented as the following steps of: determining the thickness of the material of each section of a muffle based on the specifications of materials of sections of the muffle, wherein the thicknesses of the materials of sections of the muffle are thickened; in order to make each section as long as possible, calculating the theoretic maximal length of each section by leading the upper end stress of each section to be equal to allowable stress, on the premise that the material stress of each section of the muffle is within the allowable tensile strength range based on the thickness and specification of the material of each section of the muffle; by combining the thickness and maximal length specification of the material of each section of the muffle, dividing the maximal length specification of the material of each section of the muffle by the theoretic maximal length of each section to obtain the number of segments requiring to be welded, of the actual material of the muffle and the actual length of each section; and finally, performing an addition operation on the all actual lengths of sections to obtain the whole muffle length. The method in the invention can lower the self weight of the muffle and ensure uniform and reasonable stress of the whole muffle after being welded and spliced.

Description

technical field [0001] The invention relates to a design method of a suspension muffle for a vertical bright annealing furnace, in particular to a design method for the length of each single section of the suspension muffle for a vertical bright annealing furnace. Background technique [0002] The vertical bright annealing furnace can be divided into a muffle furnace and a muffle-free furnace according to the structure of the heating section. The vertical muffle bright annealing furnace has a stepped muffle made of multi-section cylinders. The muffle is made of high-temperature resistant high-nickel alloy material (generally 601 alloy material), and multiple single-section muffle materials are curled into After the ring is welded in turn to form a single-section cylindrical muffle, the multi-section cylindrical muffle is welded to form a whole section of cylindrical stepped muffle. [0003] The upper end of the muffle is fixed on the furnace body, generally 16 to 34 meters ...

AI Technical Summary

Problems solved by technology

The unreasonable design of the length and thickness of each single-section muffle welded into the whole muffle will lead to uneven and unreasonable stress distribution of the whole muffle

When producing at high temperature, the uneven and unreasonable stress distribution of the entire muffle is prone to defects such as necking, cross-sectional deformation, banana-shaped bending, and cracking, which significantly reduces the service life, and needs to be replaced as short as half a year.

[0004] To sum up: the uneven and unreasonable stress distribution of the entire muffle is prone to accelerated failure under high temperature production conditions

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