RU2368446C1 - Mill for treatment of metallic plate by pressure - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to moulding of straight canals in sheet billet from hardly-deformed metals by rolling method on cluster mill. Group of flute-forming stand allows couples of rollers, one of which is smooth with flexible covering, the other - rigid with profile, corresponding to profile of received flutes. Before group of flute-forming stands it is installed one or several stands for perpendicular joggling of side-lay edge of sheet from its plane. After each flute-forming stand it is installed calibrate stand. The last calibrate stand in line operates for straightening of bent earlier plate edge. All stands are united into one process line and allow common drive.

EFFECT: there is expanded manufacturing capability of mill and increases quality of received products.

8 dwg

Description

The invention relates to the processing of metals by pressure, and in particular to the molding of straight channels in a sheet stock by rolling on a multi-roll mill.

As the closest analogue, we chose a mill for pressure treatment of a metal strip, consisting of a group of corrugating stands with pairs of rolls, one of which is smooth and has an elastic coating, the other is metal, has a profile corresponding to the profile of the corrugations obtained, followed by a gauge stand with metal work rolls; all stands are combined in one production line and have a common drive (patent RU 2268805, IPC B21D 13/04, 2006.01).

When forming a sheet on a device of this type, there is an uneven depth of the formed channels. The edges of the sheet are bent only by an elastic tool in the first stand, the design of which does not allow to obtain the desired value of the bending angle of 90 °. In an analogue mill, the value of the angle of bending of the edges depends mainly on the mechanical properties of the elastic tool and sheet blank, as well as on the thickness of the latter. Therefore, the magnitude of the bending angle cannot be set rigidly and for various process parameters ranges from 30 to 60 °. As a result, in the corrugating operations, the edges of the sheet are weakly held and during the formation of the extreme channels they are displaced, overcoming the friction forces, as a result, the depth of the extreme channels increases and the width of the product decreases. Also, it is difficult to form sufficiently deep channels with a width of less than 5 mm in sheets with a thickness of 0.5 ... 2 mm from hard-to-deform metals (for example, steel) and alloys on the mill of this design, since the channels are formed only by an elastic tool that cannot develop the required pressure surface of the workpiece in these cases.

The objective of the invention is to improve the quality of the products obtained through the production of products of precisely specified width with channels of equal depth. As well as increasing the depth of the formed channels and the ability to process sheet blanks with a thickness of 0.5 ... 2 mm from hard-to-deform metals, due to which the product mix will increase.

The problem is solved in that the mill for processing sheet metal during corrugation of sheet metal consists of a group of corrugating stands with pairs of rolls, one of which is smooth and has an elastic coating, the other rigid has a profile corresponding to the profile of the corrugations obtained, followed by a gauge stand with hard work rolls. All stands are combined in one technological line and have a common drive. The proposed mill is characterized in that one or several stands are installed in front of the corrugating stands for perpendicular bending of the side edges of the sheet from its plane, and calibrating stands are installed after each corrugating stands, the last gauge stand in the line also has the ability to straighten previously folded sheet edges.

In the construction of the mill in front of the corrugating stands, stands with rigid rolls are installed, which will bend the edges of the sheet by an angle of 90 °. And also after each corrugating stand with an elastic working tool, one calibrating stand with hard rolls is installed, which increases the degree of deformation of the workpiece and makes the depths of all channels equal. Such a solution will allow to obtain products of a given width, as well as to increase the depth of channel forming. The bent edges will hold the edges of the sheet quite rigidly when passing through subsequent stands, due to which the resulting product will correspond to a given width, and in the last calibrating stand on the mill line, the bent edges will be straightened, thereby reducing production waste. A cage with rigid rolls, installed after a cage with an elastic working tool, will increase the depth of channel formation and will allow processing of sheets with a thickness of more than 0.5 mm from hardly deformed metals.

List of drawings

Figure 1 - diagram of the formation of the bent edges and extreme channels in the mill of the proposed design. Figure 2 - the proposed scheme of the mill. Figure 3 is a diagram of the gauge stand 1. Figure 4 is a diagram of the gauge stand 2. Figure 5 is a diagram of the gauge stand 3. Figure 6 is a diagram of the gauge stand 4. Figure 7 is a diagram of the gauge stand 5. Figure 8 is a diagram caliber stand 6.

Presented on Fig.3 - 8 diagrams of gauge stands can be divided into three groups: Fig.3, 4 - stands for bending edges; Figure 5, 7 - corrugating stands; 6, 8 - calibrating stands.

The device of the mill is shown in Fig.2. The number of corrugating and calibrating pairs of stands and the type of profiling grooves may differ depending on the desired profile of the product. The device consists of stands with rigid rolls 1 (Figure 3) and 2 (Figure 4), which bend the edges of the sheet at an angle of 90 °, stands 3 (Figure 5), 5 (Figure 7) with an elastic working tool, intermediate stand 4 (Fig.6), containing a pair of hard rolls to increase the degree of deformation of the workpiece, stand 6 (Fig.8), containing a pair of hard gauge rolls. The rolls of the stand 6 are driven by the engine 7 through a chain gear 8, then the torque is transmitted to the previous stands by the chains 9, 10, 11, 12, 13. All installation elements are mounted on the frame 14. In all the stands, the position of the upper roll is set with the adjusting screw.

The device operates as follows. Strip 15 is fed to stand 1, then to stand 2. Rolls of stands 1 and 2 are made of steel (for example, 9X1 roll steel), they bend the edges of the sheet at an angle of 90 °. After stand 2, strip 15 is fed to stand 3. On the upper shaft 25, an elastic sheath 27 is fixed (for example, made of SKU-PFL polyurethane), the shafts are brought together so that the elastic medium of the nozzle 27 fits snugly on the profiling surface of the bandage 26. When the strip passes between the profiling the bandage 26 and the elastic sheath 27, the latter compresses the deformable strip to the forming profile of the bandage 26 and the channels are formed. To increase the depth of the channels obtained in stand 3, the strip enters stand 4, both rolls of which are made of steel (for example, 9X1 roll steel). In stand 5, an elastic shell 35 is used, which inverts part of the channels obtained in the previous stands, and further deforms the workpiece, increasing the depth of the turned channels. In the last calibrating stand 6, both profiling bandages 38 and 39 are made of hard material and are mounted on shafts 36 and 37, respectively, and when the workpiece passes between bandages 36 and 37, its profile takes on its final shape.

As in the closest analogue, in the proposed mill scheme, the formation of channels is carried out by reducing the thickness of the workpiece sheet. Due to the presence of eversion operations in the stand 5, it is possible to obtain a uniform distribution of thinning of the workpiece sheet along the channel width and increase the depth of the obtained channels.

In an analogue, the edges are bent at an angle from 30 to 60 °, and in the process of forming the channels, the sheet can be shifted, because of which it is not possible to obtain products of strictly specified width. In the proposed design of the mill, before the corrugating operations, an operation is performed to bend the sheet edges by an angle of 90 °, due to which, when forming the channels, the sheet edges will be more reliably kept from displacement and due to this it is possible to obtain products of a strictly specified width and to avoid uneven width along the length of the obtained product. In the last calibrating stand, the bent edges will be straightened, which will reduce production waste, in addition to the fact that the edges are bent for technological purposes for a better course of subsequent corrugating operations.

Also, the proposed mill design is distinguished by the presence of intermediate gauge stands, the purpose of which is to level the depth of the channels along the width of the workpiece and increase the degree of deformation of the workpiece, that is, increase the depth of the channels obtained in the previous stand with an elastic tool. The mill from the closest analogue can process sheet blanks up to 2.5 mm thick only from easily deformable metals (aluminum and its alloys), since the pressure created by an elastic tool on the surface of the workpiece is small and in the case of processing sheet blanks of greater thickness with a small channel width, the channel forming depth will be insignificant. The presence in the proposed scheme of the mill of intermediate gauge stands allows you to process sheet blanks with a thickness of more than 2.5 mm from hardly deformed metals, such as steel.

Claims (1)

A mill for processing a metal sheet by pressure during corrugating sheet metal, containing a group of corrugating stands with pairs of rolls, one of which is smooth and has an elastic coating, and the other metal has a profile corresponding to the profile of the corrugations obtained, a calibration stand with hard workers installed behind this group of stands rolls, while all stands are combined into one production line and have a common drive, characterized in that it is equipped with one installed in front of a group of corrugating stands if several stands perpendicular to the folding side edges of the sheet from its plane, caliber rolling stands laid after each gofroobrazuyuschey stand, and said calibrating cage mounted stands for a group of forming, configured to straighten the bent sheet metal edge previously.

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