JPS61216804A - Hot rolling method of aluminum - Google Patents

Abstract

PURPOSE:To prevent the sticking of part of a material to rolling rolls during hot rolling and the consequent generation of a defect on the sheet surface and to decrease rolling load by cooling both top and bottom surfaces of an Al material by cooling nozzles just before said material enters a rolling mill. CONSTITUTION:The top and bottom surfaces of an Al sheet 7 are respectively cooled by the cooling nozzles 5, 6 for the top and bottom surfaces which eject a coolant at the spread to a circular or slit shape just before the sheet 7 enters the rolling device. A lubricating oil is more preferable as the coolant to be ejected from the nozzles 5, 6 and cooling water is a good alternative. The lubricating oil having the characteristic at which the coefft. of friction decreases by about 20-30% is prepd. and used as said oil. The surface defects of the rolling material are substantially eliminated and the rolling load is decreased.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is to eliminate surface defects that occur during hot rolling of aluminum plate materials, and a part of the hot rolling method material is dented on the rolling roll. This is to prevent defects from occurring on the board surface.

[Conventional technology]

Conventionally, in hot rolling of aluminum sheet materials, with the normal rolling method, part of the material would dent the rolling rolls during rolling, and the dented material would cause a lot of damage to the surface of the rolled sheet. There was a problem that it resulted in a defective product.

[Problem that the invention seeks to solve]

The present invention was made to solve the above problems, and
This is based on the discovery that in order to prevent a part of an aluminum plate material from sticking to the rolling roll, it is effective to lower the temperature of the material surface just before the rolling roll and reduce the coefficient of friction during rolling. It is. As cooling means, cooling nozzles for cooling the surface of the aluminum plate are provided on the upper and lower surfaces of the aluminum plate. The cooling nozzle is preferably a slit-like or circularly expanding cooling nozzle, and is made of an aluminum plate.
Cool immediately before rolling. Conventionally, hot rolling mills are supplied with lubricant for lubrication and cooling of rolling rolls, but this lubricant is insufficient for cooling the rolling plate surface.

[Means for solving problems]

Embodiments of the present invention will be described below with reference to the drawings.

1 is an upper back-up roll, below which is an upper work roll 3, and correspondingly provided with a lower work roll 4 and a lower back-up roll 2; Rolling is performed between. Each role (
1), (2), (31, and (4) are heated respectively, so cooling nozzles +8+, (9), (1G
, αυ is cooled by supplying lubricant.

12 is the upper lubrication nozzle, and 13 is the lower lubrication nozzle. Q
The slip nozzles 12 and 13 use low-viscosity mineral oil or water-soluble oil with good fluidity and eject it. .

The present invention cools the upper and lower surfaces of an aluminum plate (rolled material) 7 immediately before entering the rolling apparatus as described above, and has an upper surface cooling nozzle 5 and a lower surface cooling nozzle 6, and the cooling nozzle 5, Reference numeral 6 refers to a device that sprays coolant in a circular or slit-like manner.

The coolant spouted from the cooling nozzles 5 and 6 is preferably lubricating oil, but cooling water may also be used. As a lubricating oil, one with a high viscosity is effective in terms of cooling effect, but when considering wrinkle formation and post-processing, a high viscosity is not necessarily good, and a lubricant with a friction coefficient of 20 to 30 It is advisable to prepare and use a product with properties that reduce the amount of water. As a result of examining the cooling effect, the friction coefficient when not cooled was 0.716 to 0.18, but when cooled, the friction coefficient decreased to 0.12 to 0.613, and surface defects in the rolled material were almost eliminated. . The rolling load also decreased.

〔Effect of the invention〕

The present invention has the above-mentioned configuration, and by providing the upper surface cooling nozzle 5 and the lower surface cooling nozzle 6, the friction coefficient can be reduced to 20.
The rolling load decreased by about 30 inches, and the rolling load became smaller.
It is possible to eliminate defects on the surface when hot rolling aluminum without causing part of the rolled material to burr on the rolling rolls.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an overview of the present invention. 1... Upper back-up roll 2... Lower back-up roll 3... Upper work roll 4... Lower work roll 5
...Top cooling nozzle 6...Bottom cooling nozzle 7.
... Aluminum plate 8.9, 10.11 ... Cooling nozzle 12 ... Upper lubrication nozzle 13 ... Lower lubrication nozzle Patent applicant Sumitomo Light Metal Industries, Ltd. - ° - Agent Patent attorney Fuku 1) Ho Husband: Figure 1

Claims (1)

[Claims] 1. A method for hot rolling aluminum, which comprises cooling the aluminum material by providing cooling nozzles for cooling both upper and lower surfaces of the aluminum material immediately before entering the rolling mill.