SU893303A1 - Apparatus for straightening rolled stock - Google Patents

Description

(W) DEVICE FOR CORRECTION OF THE RENT

The invention relates to the processing of metals by pressure, is intended for use primarily in the metal industry for straightening hot rolled and cold rolled sheets in production lines and can be used in engineering and other industries. A device for straightening sheet metal parts containing two rows of rolls arranged in a staggered pattern is known. A device for straightening metal sheets containing parallel-mounted rolls with protrusions on working surfaces 2 is known. The disadvantage of these devices is the inability to put rolling into alternating bending in the longitudinal and transverse directions at the same time. Closest to the proposed technical entity is a device for dressing, containing, in parallel, rolls mounted on the frame with spiral protrusions on their working surfaces 3. The disadvantage of this device lies in the low quality editing. The purpose of the invention is to improve the quality of edits. The goal is achieved by the fact that in the device containing parallelly mounted rolls with spiral protrusions, the rolls are arranged in groups, in each of which the direction of the spiral protrusions on the rolls is opposite to the direction of the protrusions on the rolls of the adjacent group. The protrusions on the roll are made with a radius of 0.1-0.5 of the outer radius of the roll, and the step of the protrusions is 4 - 1 steps of the rolls. FIG. 1 shows the arrangement of the rolls; in fig. 2 - profiled roll, cross section. The device contains two rows of working rolls 1 in staggered order. Each work roll has n lugs (an overhang located along a helical line (a four-way profiled roll is conventionally shown). The number of protrusion on the roll and the radius of the profiling are determined by the need to increase the degree of deformation. when straightening and placing on a roll a given number of protrusions. The profiling radius of the protrusions is determined from the condition of their placement on the roll. The radius of the profiling can be determined by the division the circumference of the cylindrical roll 2 R on the total number of protrusions and valleys 2p. The upper value, 5 R, where r is the radius of the protrusion, R is the radius of the roll, is determined by the minimum number of protrusions on the surface - three. is 0.52R Further decrease in the number of outlets is impractical.The lower value of the radius of profiling is determined from the condition of an unacceptable contact stresses on the surface of the straightened sheet metal. This condition is expressed by the equation. Since the device is intended for straightening sheets mainly from high-strength steel grades, the following rolling characteristics are taken into account: the modulus of elasticity E 22000 kg / mm, yield strength kg / mm, sheet thickness mm. Editing of sheets with the specified characteristics is performed on machines with a working roll diameter of at least 200-280 mm. Thus, the minimum profiling diameter, 22000x10, "" 2d 7, 0.1 | l-Tnn SS THAT and is about 0.1 of the above-mentioned work roll diameter (200 mm). Thus, the profiling radius of the work rolls is g (0.1-0.5) R The maximum degree of deformation achieved in the process of straightening on the profiled rolls and determined by e4 and according to the above formula, returns 2 or more times as the curvature radius decreases as with straightening on the cylindrical rolls ,. The rolls are arranged in this way, then the protrusions of the upper rolls correspond to the depressions of the lower slopes of the protrusions of the protrusions determined by the need to work through the entire sheet of the sheet (along its length and width by the elastic nature. contact overload by the known formula 0.58 Vi 1 ЕEr6t helix pitch; machine roll pitch; Epri respectively the reduced elastic modulus of the sheet and roll materials and the yield strength of the material sheet; however, in the case of the protrusions of the subsequent rolls contacting the sheet only on those areas where the protrusions of the previous rolls were in contact, which leads to the non-working of the guided sheet along its entire plane. To eliminate this, it is necessary to take the helix pitch of the protrusions greater than the roll pitch, and for uniform development of the sheet section, the T / t ratio must be a multiple of the number of protrusions on the roll. In the presence of a two-plane alternating bending of straightened rolled metal. Analysis of the design of the profiled work roll, as well as the deformation conditions of the edit, indicates the advantage of a symmetrical four-run roll. In view of the foregoing, the ratio T / t is assumed to be 1: k. The editing process is as follows. The rolling 2 arriving at the device falls into the gap established between the rollers 1. Here, the sheet to be guided is said to have a much larger bending radius on the protrusions of the profiled rolls than in the case of straightening on cylindrical rolls.

The bend radius in the longitudinal direction (the degree of deformation is determined by the size of the gap between the rolls LU and, at its large values, can reach values smaller than the roll radius, which is especially important when straightening high-strength steels.

The location of the protrusions at a certain angle to the generatrix provides alternating bending in the transverse direction, which is necessary to correct all types of flatness defects in sheets — warping, double-sided undulation, crescent, and so on. The degree of deformation in the transverse direction, as well as in the longitudinal direction, is controlled by the clearance gap, and is also determined by the ratio of the helix pitch and roll pitch T / t and the number of projections on one roll.

If there are two groups of machine rollers with different helix directions, sheet deformation is redistributed in two directions with an increase in the total degree of deformation. The corresponding values of the longitudinal and transverse deformations, communicated to the sheet by rollers with one direction of the helix, and, accordingly, the values reported by the rollers to another, are corrected when straightening, ensuring high flatness of the rolled steel. This eliminates the possible shift of the sheet in the transverse direction, which is possible with an unambiguous direction of the helix of all rolls of the machine.

The proposed device provides a significant increase in the total degree of deformation. So, in. Direction 1, cnupajju

existing roller roll machines, the ratio of the roll diameter to the thickness of straightened sheet metal, which determines the degree of deformation during dressing, ranges from 80 to 200. In the proposed device, due to roll profiling, this value can be reduced by 2-3 times, which is equivalent to the same increase degrees of deformation during straightening.

invention formula

Claims (2)

1. A device for straightening rolled products containing, in parallel, rollers mounted on a frame with spiral protrusions on their working surfaces, characterized in that in order to improve the quality of the straightening, the rolls are arranged in groups, in each of which the direction of the spiral extrusions on the rolls is opposite to the direction of the protrusions on the rolls of the neighboring group, 2. The device according to claim 1, about 1 tl, and that the spiral protrusions on the roll are made with a radius of 0.1-0.5 of the outer radius of the roll. 3 Device on PP. 1 and 2, characterized in that the spiral protrusions are made in steps of 4-1 rolls. Sources of information taken into account in the examination 1. USSR author's certificate W 82kk7, cl. B 21 D 1/02, 19 "OZD9. 2. USSR author's certificate No. 268361, cl. B 21 D 1/02, 05.02.69. The USSR Copyright Certificate W 196028, cl. B 21 D 3/02, 11.01,65. Spiraling direction FIG. f ulista