The invention relates to working roll form meeting requirements of control for both quadratic wave and high-order wave in hot rolling of stainless steel, in particular to a method for designing working roll form meeting requirements of both quadratic wave and high-order wave in hot rolling of stainless steel, which aims to overcome form defects of quadratic wave and high-order wave of specific-width strip steel simultaneously by means of designing of curves of roll form of a working roll on a downstream framework of a rolling machine without axial roll endplay. By a method combining the quadratic curve with the sextic curve, a special curve of the hot-rolled working roll form is formed, and the working roll form has both capacities of controlling two types of symmetrical waves including intermediate wave and bilateral wave, and also has capacity of controlling high-order wave. The coefficient of the quadratic curve is designed according to the size of the quadratic curve, the coefficient of the sextic curve is determined according to the position and size of the high-order wave, and the two type coefficient are superposed in a sectional manner after being determined. The working roll form technology is capable of meeting requirements of control for both quadratic wave and high-order wave in hot rolling of stainless steel and enriching control means for plate form during hot rolling of stainless steel.

Method for designing working roll form meeting requirements of both quadratic wave and high-order wave in hot rolling of stainless steel

The invention relates to an edge wave control method aiming at high-strength steel and work rollers thereof. The method comprises the steps of (a) machining and maintaining a continuously changed axisymmetric roll-shaped curved face at the circumferential face of each work roller, and (b) enabling the no-load roller seam between the upper and lower rollers to be continuously changed to negative convexity from zero convexity, and the length of the contact line between the upper and lower work rollers and an adjacent support roller to be reduced when the upper and lower rollers in antisymmetry arrangement are oppositely shifted along the axial direction, wherein the roller shapes of the work rollers are approximately axisymmetric vase-shaped, and the roller curves of the vase-shaped work rollers at least comprise a section of continuous waved curve consisting of a group of crests and troughs. According to the method and the work rollers thereof, both the no-load roller seam shape and the inter-roller contact line length are changed during the process that the upper and lower rollers are oppositely shifted along the axial direction, thus increasing the transverse rigidity of a rolling mill by roller shifting, achieving higher convexity control capacity and realizing the control over the edge wave during the panel-strip rolling.

Edge wave control method aiming at high-strength steel and work rollers thereof

Roll-shape configuration method of ultra-wide six-roll variable-crown cold continuous rolling mill

The invention relates to a universal design method for the roll shape of a supporting roll in cooperation with a high-order curve working roll. In the cooperation process of the supporting roll shape and the high-order curve working roll, serious asymmetric abrasion occurs easily, so that the sheet shape is greatly influenced by the inner roll shape change of the whole supporting roll in the whole service cycle; to reduce the influence, the adjusting capacity of the supporting roll to the sheet shape, the asymmetric abrasion of the supporting roll and the original high-order roll shape curve feature of the working roll are comprehensively considered, and the supporting roll shape in cooperation with any high-order curve working roll is designed. The design method has universality; only the supporting roll is designed and ground, no equipment and control system transformation is needed, and the purposes that hot rolled strip sheet shape quality is improved, the service cycle of the supporting roll in cooperation with the high-order curve working roll is prolonged, and labor productivity is improved can be achieved.

Universal design method for roll shape of supporting roll in cooperation with high-order curve working roll

Method for grinding plain roll from plain profile into CVC (continuous variable crown) profile

The invention provides a variable convexity working roll for rolling plates, sheets and strips, and a roll shape curve thereof adopts a composite function. The special roll shape curve form of the working roll can balance the secondary convexity control capability of wide and narrow strip steel at the same time of ensuring the secondary convexity regulation capability of no-load roll gap and the shift amount of a rolling roll to show an approximate linear relationship. Compared with the continuous variable convexity roll shape technology, the variable convexity working roll improves the control capability to the narrow strip steel under the situation of also having stronger convexity control capability to the strip steel with wide specification; in addition, the variable convexity workingroll further has the control function to high-order wave shape, thereby enhancing the whole plate shape control capability of a rolling machine and meeting the technical requirements on high-precisionrolling of plates, sheets and strips.

Variable convexity working roll for rolling plates, sheets and strips

The invention discloses a strip-rolling variable contact support roller and a processing method thereof. Roll forming curves are superposed by using a five-section sine function, so the contact line length between the support roller and a working roller is close to the width of the rolled strip steel, the harmful contact area during the rolling process is decreased, the regulating and controlling function of the roller force is promoted, the roll-gap crosswise rigidity is increased, the contact pressure between rollers is uniformed, and the accident that the edge of the roller falls off is decreased or completely eradicated. During the grinding process, a superposed roller forming of a variable contact section and a chamfer section at two sides of the roller is firstly grinded and then the whole roller is grinded so as to promote the processing efficiency and decrease the grinding wheel consumption. The support roller of the invention is convenient to design and process and is easy to realize the industrial application.

Strip-rolling variable contact support roller and processing method thereof

The invention provides a method for designing a roll shape of a variable-crown working roll which is used for plate shape control in strip steel production and has quartic crown control capacity. By using the method, the approximate linear relationship between a no-load roll gap quadratic crown and the channeling shift amount of a roll is ensured, and simultaneously the quadratic crown capacity of wide and narrow strip steel can be balanced. By utilizing the corresponding relationships among roll shape coefficients provided by the invention, a variable-crown roll shape of a quintic polynomialfunction can be designed flexibly according to the requirement on quadratic and quartic crown control. The method has the characteristics that: the roll shape designed by the method can change the characteristic that a quadratic crown control range is in square drop along with the reduction of the width of the strip steel. Compared with a cubic CVC roll shape, the roll shaped designed by the method can not only provide the quartic crown control capacity, but also provide higher quadratic crown control capacity. Compared with a quintic CVC roll shape designed by other methods, the method has convenient design, can design flexibly according to the requirement on the quartic crown control, and can balance the quadratic crown control capacity of the wide strip steel and the narrow strip steel.

Jie Zhang

Papers

Variable convexity working roll for rolling plates, sheets and strips

Strip-rolling variable contact support roller and processing method thereof

Method for designing roll shape of variable-crown working roll with quartic crown control capacity