Annealing method and device of bell type furnaces

A bell-type furnace and annealing technology, which is applied in the field of combined bell-type furnace annealing and bell-type furnace annealing, can solve the problems of non-recyclable heat, low heat transfer efficiency, high operating cost, etc., to save equipment investment and operating costs, The effect of good operational flexibility and simplified operation process

Active Publication Date: 2011-04-06
SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the existing steel bell furnace annealing are: the bell furnace is heated or cooled separately during the annealing process, and the heat cannot be recycled, resulting in a waste of energy; the use of the heating hood to indirectly heat the steel in the protective hood results in low heat transfer efficiency , easy to cause steel sticking; frequent cover changes, high operating costs, high labor intensity, and poor safety
However, this patent requires complex protective gas preparation, heating and transportation processes, and the heat treatment takes a long time

Method used

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  • Annealing method and device of bell type furnaces
  • Annealing method and device of bell type furnaces
  • Annealing method and device of bell type furnaces

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Embodiment 1

[0018] Bell furnace device of the present invention such as figure 1 , image 3 As shown, it includes a bell furnace 1 and a supporting protective gas system, a heating system and an exhaust system. The bell-type furnace is provided with a furnace cover 5 and a stove base 14, and a fan 9 and a rack are arranged in the furnace cover, and the fan is driven by a motor 4. The top of the furnace cover is provided with a chain 10 for hanging the material to be annealed. Five bell furnaces are installed in series, two preheating bell furnaces 1a, 1b, two cooling bell furnaces 1d, 1e and one heating bell furnace 1c. The lower part of each hearth is provided with a conveying channel 3 for conveying the material to be annealed, and a conveying device 15 is arranged in the conveying channel. A plug valve 17 is provided between every two bell-type furnaces in the conveying passage 3, and a sealing valve 16 is provided between the bell-type furnace body and the conveying passage. Such ...

Embodiment 2

[0021] Another embodiment of the present invention is as Figure 4 As shown, six bell-type furnaces are installed in series, two preheating bell-type furnaces 1a, 1b, two cooling bell-type furnaces 1d, 1e and one heating bell-type furnace 1c, 1f, and other structures are the same as in the embodiment. In this embodiment, a heating bell-type furnace is added. After the high-temperature preheating bell-type furnace 1b is preheated, the strip steel to be processed alternately enters the heating bell-type furnace 1c or 1f, and the heating bell-type furnace 1c or 1f completes heating and heat preservation. After the process, the strip steel is sequentially transported to the high-temperature cooling bell furnace 1d, cooled to 440-450°C, and continued to cool to 220-230°C in the low-temperature cooling bell-type furnace 1e, and discharged through the discharging equipment. Other operations and process conditions are identical with embodiment.

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Abstract

The invention provides an annealing method and device of bell type furnaces, comprising 3-12 bell type furnaces and auxiliary systems, wherein each bell type furnace is internally provided with radiant pipes, the radiant pipes in a cooling bell type furnace are communicated are communicated with a preheating bell type furnace, and the radiant pipes in the preheating bell type furnace are communicated with the cooling bell type furnace. The bell type furnaces work in a serial connection mode and are respectively used for preheating, heating and cooling processes, materials to be annealed are sequentially conveyed among the preheating bell type furnace, a heating bell type furnace and the cooling bell type furnace, and the materials to be annealed in the preheating bell type furnace are heated by using heat generated by the cooling state bell type furnace through the circulating flow of shielding gas. In the invention, the shielding is adopted for direct heating, therefore a heating bell and a cooling bell are omitted, a flow is simplified, equipment investment and operation cost are saved; and dirt on the surfaces of the materials to be annealed are removed in the preheating bell type furnace, the heating process and the cooling process are carried out in a clean furnace, and the surface quality of an annealed product is good.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and relates to a method and a device for annealing a bell-type furnace, in particular to a method and a device for annealing a combined bell-type furnace. Background technique [0002] Material annealing mainly has two basic functions, one is to eliminate the hardening and residual stress generated during processing, soften the material, improve plasticity, and facilitate further processing; the other is to change the structure of the material to obtain the required grain size and grain size. Orientation. Bell furnace annealing is one of the main technologies for heat treatment of cold-rolled steel. It is to stack several coils of steel into stacks, cover them with a protective cover, heat them up, reach the specified annealing temperature, and then cool after heat preservation. Generally, the annealing of the bell furnace adopts the single-stack or multi-stack type. Af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74
Inventor 贾会平
Owner SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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