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Method and apparatus for tempering material

Inactive Publication Date: 2012-03-15
BENEQ OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007]An advantage of the method and apparatus of the invention is that the use of small droplets for cooling hot material in a tempering process enables an energy efficient means for tempering a hot material. The small droplets allow a rapid and efficient heat transfer from a hot piece to be achieved. Uniform and rapid heat transfer is particularly important when large surfaces and thin products, such as thin glass, are to be tempered. Cooling produced with small droplets consumes significantly less energy than prior art air cooling and, moreover, a tempering apparatus based on the use of small droplets has a structure that is simpler to produce.

Problems solved by technology

These extremely small droplets evaporate rapidly as they collide with the hot material, thus removing efficiently thermal energy from the hot material.

Method used

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  • Method and apparatus for tempering material
  • Method and apparatus for tempering material

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Embodiment Construction

[0013]Reference is made to FIG. 1, which discloses an embodiment of the apparatus of the invention that allows the method of the invention to be implemented. The apparatus 50 is used for tempering a moving hot material web 26. The material to be tempered may be for example metal, such as steel, glass, metal alloy or a ceramic material. Although FIG. 1 shows the tempering of a moving material web, the method and apparatus of the invention may be applied to the tempering of any material or product movable in any way. Alternatively, the material or product to be tempered may also be stationary and one or more sprayers may move. In accordance with the invention the apparatus 50 comprises a sprayer 22 that allows the one or more liquids to be atomized into small droplets. When necessary, the apparatus 50 may also comprise two or more sprayers 22. The liquid to be atomized with the sprayer 22 to be used in tempering is preferably water, although it may also be an alcohol, such as a mixtur...

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Abstract

A method and apparatus for tempering material is provided. One or more liquids are atomized by at least one sprayer into droplets which are guided towards a surface of a hot material so that at least some of the droplets collide with the surface of the hot material and evaporate, thus removing thermal energy from the surface layer of the hot material. Impact members may be used to further reduce the size of the droplets. The droplets may be guided to the surface by a separate guiding gas flow.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to a method according to the preamble of claim 1 for tempering material and to apparatus according to the preamble of claim 16 for tempering material.[0002]According to prior art metals, such as steel, glass and other materials are tempered by air cooling. It is also known to temper a piece to be tempered by immersing the hot piece into water. In tempering based on air cooling, a strong flow of air is directed to the material to be tempered or to a surface of a product. The strong flow of air is used with the aim of reducing the temperature of the material rapidly, the structure and / or properties of the material undergoing changes that provide the material with desired characteristics. Steel tempering, for example, is understood to mean heating the steel above the temperature of austenite formation and cooling it, after a holding period required for the austenite formation and homogenization, at a rate faster that the critical c...

Claims

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Application Information

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IPC IPC(8): F28D5/00
CPCB05B1/26B05B7/045C21D1/667C03B27/024C03B27/028C03B27/02B05B7/066B05B7/0846
Inventor AHONEN, SAMPOKARVINEN, REIJOVAINIO, TOMMI
Owner BENEQ OY
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