RU2065787C1 - Method of aluminum band with salient-concave shape rolling - Google Patents

Abstract

FIELD: rolling production. SUBSTANCE: aim is to prevent aluminum sticking to rolls of rolling mill during production of aluminum band with salient-concave shape. Method provides for billet rolling in cylindrical rolls with salient-concave shape of surface. Rolling is exercised together with metal band, thickness of which is no more than depth of shape and that is passing between rolls and rolled billet. Firmness of metal band must be no less than firmness of billet and no higher, than firmness of rolls. EFFECT: method allows to prevent aluminum sticking to rolls with salient-concave shape of surface. 1 tbl

Description

 The alleged invention relates to the field of metal forming and can be used in the manufacture of aluminum tape with a convex-concave relief.

 A known method of producing sheet steel with a pattern, comprising crimping a steel sheet with a thickness of 0.3 mm in cylindrical rolls with a diameter of 40-300 mm with a convex-concave surface relief (Japan z. N 60-2922, MKI B 21 B 1/22, 1985 .).

 This method does not allow to obtain an aluminum tape of arbitrary thickness and high surface quality, since during the rolling process, aluminum sticks to the rolls, followed by transfer of the sticks to the rolled tape for aluminizing.

 A known method of rolling a metal strip with a convex-concave relief, including the compression of the workpiece in cylindrical rolls with a convex-concave surface relief (Japan, application N 56-20096, MKI B 21 D 13/04, 1981).

 The disadvantage of this method is the impossibility of producing aluminum tape of arbitrary thickness and high-quality surface relief (for example, such as an “orange peel”), since during the rolling process, aluminum sticks to the rolls of the rolling mill with subsequent transfer of the sticks to the pierced tape. In addition, the convex parts of the topography of the roll at the exit of the deformation zone during rolling produce a tearing of the workpiece material from its concave part, which violates its integrity and, accordingly, reduces the mechanical properties of the product.

 A method for rolling an aluminum strip with a convex-concave relief by compressing a workpiece in cylindrical rolls with a convex-concave surface relief through a metal strip with a thickness not exceeding the depth of the gap passed between the rollers and the rolled workpiece is proposed, while the hardness of the metal tape is not less than the hardness of the workpiece, but not exceeds hardness of rolls.

 The proposed method differs from the prototype in that the compression of the workpiece is carried out through a metal strip with a thickness of not more than the relief depth passed between the rolls and the rolled workpiece, while the hardness of the metal tape is not less than the hardness of the workpiece, but does not exceed the hardness of the rolls.

 The technical result of the proposed method is to improve the quality of the surface: a high level of gloss, sharpness of the relief, reduced roughness due to the exclusion of aluminum rolls, as well as an increase in the mechanical properties of the tape by eliminating the tearing of the workpiece material at the exit from the deformation zone.

 Compression of a workpiece with a thickness of not more than the depth of the relief through a metal strip passed between the rolls and the rolled workpiece with a hardness of the metal tape of not less than the hardness of the workpiece, but not exceeding the hardness of the rolls, excludes direct contact of the workpiece with the rolls, which does not allow aluminuming of the rolls and, accordingly, rolled aluminum tapes, providing surface quality, including a high level of gloss, clarity of relief and reduced roughness. The metal tape works as a technological lubricant and, in addition, as a result of the sliding of the convex parts of the relief of the rolls on its surface, the workpiece material does not tear out at the exit from the deformation zone, which guarantees a given level of mechanical properties of the product.

 When the thickness of the metal tape is greater than the depth of the rolls relief, the pressure of the relief roll on the rolled billet is smoothed, as a result of which the relief on the aluminum tape is not clearly visible.

 When the hardness of the metal tape is less than the hardness of the workpiece, the roll relief pushes the material of the tape, which during the rolling process does not bend and does not tighten the relief of the roll, which leads to a fuzzy transfer of the given relief to the aluminum tape.

 When the hardness of the metal tape is greater than the hardness of the rolls, it does not fit the rolls during rolling, depending on the rolling pressure, the tape either breaks or the relief on the product is not printed.

 Examples of the method.

1. According to the proposed method, the aluminum tape is a blank of grade A7 with a thickness of 0.8 mm and a shore hardness of 5 units. rolled on a Duo mill with a roll diameter of 260 mm, a Shore hardness of 95 units. and a convex-concave surface relief of the type of "orange peel" 0.3 mm deep. Compression of the workpiece was carried out through a metal strip of different alloys with a thickness of 0.25 mm. Band Material:
stainless steel (shore hardness 20 units),
copper (shore hardness 7 units),
nickel (Shore hardness 9 units),
aluminum (shore hardness 5 units).

When rolling, two compression methods were used:
between the rolled billet and the rolls a metal tape was passed with the subsequent separation of the product and tape by winding on different coilers,
an endless metal strip was put on the rolls of the rolling mill in the form of shells-bandages.

 A shiny aluminum tape of high quality surface was made with a clear relief of 0.3 mm depth without tearing and breaking integrity.

 Steel tape was reused with the same effect.

 2. According to the prototype method, an aluminum tape of grade A7 with a thickness of 0.8 mm was crimped on a rolling mill with a roll diameter of 260 mm with a convex-concave relief, the pitch of which is 15 mm.

 The manufactured aluminum tape had a matte color with traces of aluminization and relief tearing.

 The results are presented in table 1.

 As can be seen from table 1, the surface quality and mechanical properties obtained by the proposed method of aluminum tape is significantly higher than that of the tape obtained by the prototype method. This leads to an increase in the yield of the tape by 14-18% due to the absence of defects in surface quality and mechanical properties, and also due to the exclusion from the technological cycle of the expensive operation of regrinding rolls to eliminate aluminization. TTT1

Claims (1)

 A method of rolling an aluminum strip with a convex-concave relief, comprising compressing the workpiece in cylindrical rolls with a convex-concave surface relief, characterized in that the compression of the workpiece is conducted through a metal tape with a thickness of not more than the depth of the relief passed between the rollers and the rolled workpiece, while the hardness is metallic tape not less than the hardness of the workpiece, but not more than the hardness of the rolls.

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