SU1680401A1 - Method for manufacturing roller sheets - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be applied in the rolling industry with the production of sheet steel with increased demands on surface quality. The purpose of the invention is to improve the surface quality of the finished sheet productivity and reduce the cost of stripping by imparting an optimum relief to the surface of the workpiece. The essence of the method consists in stripping the surface of the workpiece with abrasive grinding wheels, in the subsequent heating and rolling of the workpiece. The novelty in the method is that the choice of grit of abrasive wheels is made according to the dependence determined experimentally. The grain of the circle is optimal when it is determined in proportion to the magnitude of the metal billet of the workpiece during heating and the subsequent total heat loss during rolling. This allows you to reduce the auxiliary time when processing sheets and use a more productive tool. 1 tab. cl

Description

The invention relates to ferrous metallurgy and can be applied in the rolling industry with the production of sheet steel with increased demands on surface quality.

The purpose of the invention is to increase the productivity. Reduce the cost of stripping by imparting an optimal surface relief.

Billets of 08x18T1 steel with dimensions of 1100x165x3900 were cleaned with abrasive grinding wheels, subjected to heating in a continuous furnace and rolling.

When implementing the method at the preparatory stage, knowing the subsequent total stretch for each particular batch of billets, the steel grade of these billets, i.e. know the magnitude of the stub of this steel grade when heated in a continuous furnace (at

specified modes), Determine the grain of the abrasive wheel. Then, the workpieces were cleaned on abrasive grinding machines with abrasive wheels that have optimal grain size (determined according to the claimed dependence) for the given batch of workpieces and allow for stripping with maximum productivity and minimal cost of the abrasive tool. After stripping, the surface of the blanks had a certain roughness (depending on the grain of the abrasive wheel used). At the next stage, the cleaned blanks entered the continuous furnaces, where as a result of heating, scale was formed on the surface of the blank.

Os 00

oh oh

Before rolling, blanks were removed from the blanks leaving the heating furnaces. Then the heated billets were fed to the rolling mill, where they were rolled to a certain size.

The grain size of abrasive wheels, determined by the proposed relationship, corresponds to the desired one when the metal loss value varies within 3.3–9.1 kg / m4, and the subsequent total stretch during rolling in the range of 50–150.

In order to obtain comparative data in parallel with the production of thin-rolled sheet metal, according to the proposed method, the production of thin-rolled sheet was carried out according to the basic technology, where the stripping of the blanks was carried out with fine-grained circles.

The test results are presented in the table.

As can be seen from the table, using the proposed dependency to determine the grit of the abrasive grinding wheel, which was obtained experimentally, allows you to choose an abrasive range with optimum grit for cleaning (fsfe table 6-28) and carry out stripping with maximum performance and good quality of the rolled sheet surface. , to reduce the consumption of abrasive grinding wheels and the specific costs for it (table, No. 6-10 and 12-28); to minimize the use of fine-grained circles (table. N 11), justifying their use for a certain volume of products. The volume of the finished sheet produced by the mode

Ms 11, is not more than 1% of the total volume of manufactured sheet products.

When determining the grain of the abrasive wheel, regardless of the parameters

method, there is either an increase in the consumption of abrasive wheels, an increase in the cost of the cleaning process, a decrease in productivity (table No. 1-3. 35-37), or a deterioration in the quality of the surface

finished sheet (table, Mg 4 and 5. 29-33). or to the discrepancy between the value of the calculated grain size, the practical use of the grain sizes of abrasive wheels, (table, No. 34, 38-40).

Claims (1)

Thus, the proposed method allows to reduce the consumption of abrasive wheels and increase productivity in the production of sheet metal. Invention Formula Method for the production of sheet metal mainly from corrosion-resistant steels, including cleaning the surface of the workpiece with abrasive grinding wheels, subsequent heating and rolling the workpiece, characterized in that, in order to increase productivity and reduce costs by imparting an optimum relief to the surface of the workpiece, stripping is carried out pre-selected circles of a given grain size A, which is vibrated according to C / i ° 5, where 5 is the proportionality coefficient, m / kg; C is the magnitude of the metal loss, kg / m2. / and - the value of the total extract during rolling. Interconnection of grit of abrasive wheels, stripping process used in the processing of slabs, burns of slabs, extracts with indicators of the quality of cold-rolled sheet 31 60 150 3.5 36,100 100 3.15 74 62 14 7.2 No 10.4 Stripping process performance Price increase protesters stripping and si ga performance