RU201757U1 - Roller straightening machine for straightening stainless steel strips - Google Patents

Abstract

The utility model relates to the field of metallurgy, in particular to the straightening of strips made of corrosion-resistant steel with a thickness of 1.2 mm. Upper and lower cassettes are installed on the leveler bed. The entry and exit cushions of the upper cassette are vertically adjustable. One support roller is installed in the input pad, under which two driven working rollers are installed on one horizontal axis with their centers shifted at equal distances from the vertical axis of the support roller. In the inlet cushion of the lower cassette, two support rollers and one working roller are mounted one above the other on the same axis, forming the first assembly in the form of a saddle with the driven work rollers of the inlet cushion of the upper cassette. In the output cushion of the upper cassette, two support rollers and one working roller are installed one above the other, one support roller and two driven work rollers are installed in the output cushion of the lower cassette, forming a second assembly in the form of a saddle with the working roller of the output cushion of the upper cassette. In the center of the first and second units, respectively, the first and second non-driven working rollers with a diameter of 30 mm are installed. The result is a high-quality correction of flatness deviations along the entire length of the sheet. 2 ill., 1 ex.

Description

The utility model relates to the field of metallurgy, in particular to the straightening of sheet metal. It is known that after rolling of strips of corrosion-resistant steel, their yield point increases to 1100-1200 MPa, and their plastic properties decrease.

To straighten sheet corrosion-resistant steel with the specified properties, it is necessary to deform the strip, which has a large curvature, which can be done qualitatively by using small diameter working rollers. When straightening on traditional roller levelers (RLM), the minimum diameter of the rollers is determined by the inner diameter of the bearings in which their axles are installed. The analysis shows that the minimum diameter of the RPM rollers when straightening strips of corrosion-resistant steel with a thickness of (0.8-1.2) mm should be 30-50 mm (Slonim A.Z., Sonin A.L. Machines for straightening sheet and long products / M .: Mechanical Engineering, 1975, 208 p.).

Known roller sheet straightening machine containing two rows of straightening rollers, staggered, the lower row is stationary on the bed, all the rollers are driven, and the upper row is located in fixed traverses (RU 2365445, IPC B21D 1/02, publ. 27.08. 2009).

Known roller straightening machine for straightening strip, containing located on the bed in a staggered manner movable and stationary clips with straightening rollers (SU 1080295 A1, IPC B21D 1/02, publ. 20.05.1996).

The disadvantage of the above roller straightening machines is the impossibility of obtaining good quality straightening of the strip made of corrosion-resistant steels due to the fact that the straightening of the strips is carried out on rollers of large diameter - 150-200 mm.

The closest to the proposed roller straightening machine is a sheet straightening machine containing the upper and lower cassettes installed in the bed, carrying the straightening drive rollers, arranged vertically (RU 2228231, IPC B21D1 / 02, publ. 10.05.2004).

The disadvantage of the prototype is the lack of technological capabilities for straightening strips in rollers with a diameter of 30-50 mm.

On traditional RPMs, strips and sheets of corrosion-resistant steels such as 12X18H10T, 08X18H10T, 08X18H10, 12X18, 08X17T, 12X17, as well as AISI (USA) 316, 310, 321, AISI (USA) 410, 420, 430 are straightened.

The technical task of the proposed utility model is to improve the quality of straightening of strips made of corrosion-resistant steels with a thickness of 0.8-1.2 mm by installing rollers with a diameter of 30-50 mm.

The technical result is achieved by the fact that the roller straightening machine for straightening strips made of corrosion-resistant steel contains a frame in which the upper and lower cassettes are installed, carrying the correct drive rollers, according to the utility model, the upper and lower cassettes are made of two pillows, input and output, upper the inlet and outlet cushions are installed with the possibility of vertical adjustment using pressure screws, one support roller is installed in the upper inlet cushion in the bearing supports, under which they are installed on one horizontal axis, with their centers displaced by equal distances relative to the central vertical axis of the support roller, two driven working roller; in the lower inlet cushion in bearing supports, two support rollers and one work roller are installed one above the other on the same axis, two driven work rollers mounted on a horizontal axis in the upper inlet cushion and a work roller installed in the lower inlet cushion form the first assembly in the form of a saddle, in the center of which is installed in contact with the working roller of the lower pad, the first non-driven working roller of small diameter; in the upper output cushion in bearing supports, two support rollers and one working roller are installed one above the other on one axis; one support roller is installed in the lower output cushion in the bearing supports, above which they are installed on one horizontal axis, with their centers shifted by equal distances relative to the central vertical axis of the support roller, two driven work rollers; said rollers mounted on a horizontal axis in the lower output cushion and a working roller mounted in the upper output cushion form a second saddle-like assembly, in the center of which a second small diameter non-driven work roller is installed in contact with the upper cushion working roller; at the entrance and exit of the bed, one pair of drive rollers is installed, between the feed rollers and small diameter rollers.

One of the distinguishing features of the proposed device is that the upper cassette is made in the form of two pillows, inlet and outlet, installed movably in the frame windows at the entrance and exit to the RPM, with the possibility of their vertical adjustment using the pressure screws installed on the top of the frame with a drive. The lower cassette is made in the form of two, inlet and outlet, lower pillows installed movably in the frame windows, at the entrance and exit to the RPM. The bearing supports of the drive and supporting rollers of the RPM are fixed in the pillows.

The distinctive essential features of the proposed utility model also include the arrangement of the working rollers in the units made in the form of a saddle fixed in the corresponding pads. Small diameter idle rollers are installed inside these units. Moreover, the first assembly in the form of a saddle is installed at the entrance to the RPM and consists of the first idle roller installed between two driven upper rollers and one driven lower roller. The second saddle assembly is installed at the outlet of the RPM and consists of a second small diameter idler roller installed between two driven lower rollers and one driven upper roller.

These features allow high-quality straightening of corrosion-resistant steels on the RPM. At the entrance to the RPM, straightening is carried out using the first unit, assembled in the form of a saddle from the working rollers, where the strip is bent upward, and at the outlet of the RPM, using the second unit, where the strip is bent downward.

The device is illustrated by drawings in Fig. 12.

FIG. 1 shows a roller straightening machine for straightening stainless steel strips (top view). FIG. 2 shows a section a-a.

Roller straightening machine (Fig. 1, 2) for straightening sheet metal made of corrosion-resistant steels, has a rectangular welded frame 1. In the windows of the frame 1 (Fig. 2), they are movably mounted, with the possibility of vertical adjustment using pressure screws 25 and 26 with a drive from the electric motor through a gearbox (not shown in Fig. 2), two pillows: upper inlet 2, upper outlet 4. Two lower pillows: lower inlet 3, lower outlet 5 are installed movably in bed 1. In the upper inlet pad 2 along the width of bed 1 in the bearing supports installed on both sides, a support roller 7 is installed, under which there are driven working rollers 8, 9. The drive rollers 8, 9 are located on the same horizontal axis with an offset of their centers at equal distances C relative to the central vertical axis of the support roller 7.

The distance C is

where D ₈ is the diameter of the driven working roller 8,

D ₉ - diameter of the driven working roller 9.

20 mm - assigned depending on the condition of the rollers, taking into account the wear of the rollers.

In the lower input cushion 3 along the width of the bed 1 on both sides (left and right) in bearing supports, two support rollers 10, 11 and a driven work roller 12 and a driven work roller 12 are installed above each other on the same axis. the inlet cushion 2 and the working roller 12 mounted in the lower inlet cushion form the first saddle-like assembly. A non-driven (idle) working roller 6 is installed in the center of the first assembly in the form of a saddle. A small-diameter non-driven roller 6 is installed in contact with the working roller 12.

In the lower output cushion 5 along the width of the bed 1 on both sides (left and right) in bearing supports, there are driven work rollers 14, 15, under which a support roller 16 is located. Drive rollers 14, 15 are located on one horizontal axis with an offset of their centers at equal distances C relative to the central vertical axis of the support roller 16.

The distance C is

where D ₁₄ is the diameter of the driven working roller 14,

D ₁₅ - diameter of the driven work roller 15.

20 mm - assigned depending on the condition of the rollers, taking into account the wear of the rollers.

In the upper output cushion 4 along the width of the bed 1 on both sides (left and right) in bearing supports, a working roller 17 and support rollers 18, 19 are installed on the same axis above each other.

The driven work rollers 14, 15 mounted in the lower outlet cushion 5 and the work roller 17 mounted in the upper outlet cushion 4 form a second saddle assembly. In the center of the second assembly in the form of a saddle, a second non-drive (idle) roller of small diameter 13 is installed. A non-drive roller of small diameter 13 is installed in contact with the driven work roller 17. A pair of drive rollers 20 feeding metal is installed at the entrance to the bed 1, and at the exit from the bed 1 a pair of feed drive rollers 21 is installed. The rollers 20, 21 are driven by an electric motor through a gearbox and a gear stand (not shown).

Wiring 22 is placed between rollers 20 and frame 1, wiring 23 is placed between first small-diameter non-drive roller 6 and second small-diameter non-drive roller 13, wiring 24 is placed between drive rollers 21 and frame 1. Wiring is rigidly fixed to frame 1.

The roller leveler works as follows.

With the simultaneous rotation of the pressure screws 25 and 26, the upper inlet and outlet cushions 2 and 4 move vertically downward. When the pillow 2 moves down, the support roller 7 and the working rollers 8 and 9 placed in it go down, creating between the rollers 8, 6 and 9, 6 gaps equal to the thickness of the metal strip supplied for straightening (0.8-1.2 mm).

When the cushion 4 moves down, the support rollers 17, 18, 19 placed in it fall down, imparting a vertical downward movement to the roller 13. This creates gaps between the roller 15 and the roller 13, as well as between the roller 14 and the roller 13. The size of these gaps is equal to the thickness of the strip for straightening (0.8-1.2 mm).

The drive (not shown in Fig. 2) of a pair of drive rollers 20 is turned on and the processed strip is fed through the wiring 22 into the gap formed by the first small-diameter roller 6 and the working rollers 8 and 9. Further, along the wiring 23, the strip is fed into the gap between the second roller of the small diameter 13 and working rollers 14 and 15. Through the wiring 24, the strip is fed into a pair of drive rollers 21 installed at the outlet of the RPM.

In this case, the strip is bent on the first working roller of small diameter 6 with an upward bend, and on the second working roller of small diameter 13 with a downward bend, the strip is straightened with an initial positive and negative curvature, with an alternating bend.

Example. As an example, consider an RPM for straightening strips made of corrosion-resistant steel grade 12X18H10T with a thickness of 1.2 mm in rollers with a diameter of 30 mm.

For the first and second saddle assembly, use the following roller sizes. The first and second non-driven rollers, mounted in saddle assemblies, are taken with a diameter of 30 mm. In the first and second assemblies in the form of a saddle, in the upper inlet cushion and in the lower outlet cushion, support rollers are installed, which have a diameter of 200 mm, and the working drive rollers have a diameter of 100 mm, they are installed with an offset of 120 mm. The diameters of the two support rollers installed in the lower inlet cushion and in the upper outlet cushion are equal to 150 mm and 100 mm, respectively, and the diameters of the two working drive rollers installed in the lower inlet and upper outlet cushions are 60 mm.

The proposed device allows for high-quality correction of deviations from flatness along the entire length of a sheet of corrosion-resistant steel.

Claims (1)

Roller straightening machine for straightening strips made of corrosion-resistant steel with a thickness of 1.2 mm, containing a frame in which the upper and lower cassettes are installed, carrying rollers, characterized in that it is equipped with two pairs of drive rollers feeding the strip to be processed, one of which is installed at the entrance to frame, and the second at the exit from it, while the upper and lower cassettes are made of input and output cushions, of which the input and output cushions of the upper cassette are installed with the possibility of vertical adjustment by means of pressure screws, and in the input cushion of the upper cassette in bearing supports one support roller, under which two driven working rollers are installed on one horizontal axis with their centers displaced by equal distances relative to the central vertical axis of the supporting roller, in the input cushion of the lower cassette in bearing supports two support rollers and one working roller are installed above each other on the same axis roller forming with two drives the first assembly in the form of a saddle, in the center of which, in contact with the working roller of the inlet cushion of the lower cassette, is installed the first non-driven working roller with a diameter of 30 mm, in the output cushion of the upper cassette in bearing supports two support roller and one work roller, one support roller is installed in the output cushion of the lower cassette in the bearing supports, above which, on one horizontal axis with an offset of their centers by equal distances relative to the central vertical axis of the support roller, two driven working rollers are installed, forming an output roller with the working roller cushions of the upper cassette is the second assembly in the form of a saddle, in the center of which, in contact with the working roller of the output cushion of the upper cassette, a second non-driven working roller with a diameter of 30 mm is installed, and between the pairs of drive rollers feeding the strip being processed and the non-driven working rollers, wiring is installed, prisoners on the bed.

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