SU1452846A1 - Method of strengthening rolled plate - Google Patents

Abstract

The invention relates to heat treatment of sheet metal. The aim of the invention is to simplify the technology and improve the quality of sheet processing. To implement this method, rolled sheets of steel grade 09G2 with a thickness of 8 mm are cooled from a temperature of 950 to 20 ° C between plates with a thickness of 20 mm and circular holes of 15 mm in diameter, evenly spaced. With a total area of hardened areas equal to 25%, the following mechanical properties of the sheet are obtained: yield strength (6t) 00 N / mm, tensile strength (A,) 585 N / mm, relative elongation (f5 24% .2 ill., 1 tab. . (C (L

Description

The invention relates to heat treatment of sheet metal.

The aim of the invention is to simplify the technology and improve the quality of sheet processing. FIG. Figure 1 shows a scheme for carrying out the proposed method in cooling a sheet, respectively, between the shields with slots (openings) ii between the plates with protrusions. I Figure 1 shows a, b, c, and d - examples of the possible location of oversized areas (darkened). This arrangement is recommended for a constructive strength yuvshi

sheet.

I FIG. 2 shows a, b, c, d examples of the possible location of the enhanced sections (darkened). This arrangement is recommended to increase the sheet wear resistance while {maintaining sufficient structural strength. .

In order to carry out the method, sheets AND with a temperature higher than Ac (after heating or hot rolling) are fixed between two thermocouples 2 with holes (slots): or projections in shape, size and: total area relative to leaf area, corresponding to | given and kept up to the required temperature. The total area of the hardened areas can vary in the Ø1-Foki range of O - 100%, and the possibilities of changing the shape, size, and orientation of the hardened areas are practically unlimited. The application of the proposed method for sheets of carbon and low-alloyed steels makes it possible to regulate within wide limits the properties of sheet metal. In this case, the mechanical properties change in proportion to the total area of the hardened sections, as shown in the table for sheet steel

09Г2 with a thickness of 8 mm, cooled from a temperature of 950 to 20 ° C between slabs with a thickness of 20 mm and round holes with a diameter of 15 mm, evenly spaced.

It can be seen from the data presented in the table that the properties of rolled products vary widely, i.e. it is possible to control the characteristics of the metal over a wide range.

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Formula

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acquisitions

The method of sheet metal hardening with individual sections of a given shape, size and orientation over the area, including its heating Bbmie point Ac 3 and cooling, o

so that, in order to simplify the technology and improve the quality of processing, the entire surface of the sheet is heated, and the reinforcement is produced by selectively cooling the surface of the sheet.

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Claims (1)

Claim The method of hardening sheet metal in separate sections of a given shape, size and orientation over an area, including its heating above the Acj point and cooling, characterized in that, in order to simplify the technology and improve the quality of processing, the entire surface of the sheet is heated, and hardening is carried out by selective cooling sheet surface. ss g! ® gS P® kga tffii feis! fig? · “: FS ^i: .'S Γ · τ ~ · * ggl -'- g ·? ·: '*' - 1 Li.Vi st * :! i ··. ': sa L: V.-J ζ & ϊ ·: ΐ It'A> v. * j ··· (? ** it,, t * · Ί2 * · ί t / dZD Eagle2 ·} x? I * '' 5 that & fesii fc = g. £ B h