The invention relates to a working roll forming technology taking grinding precision and efficiency and cold-rolled electrical steel edge drop control into consideration. The sectional roll forming function method is adopted, a special cold-rolled working roll forming curve is formed, and the coefficient of an exponential function curve in the roll forming curve is designed according to the situation of band steel edge drop; a primary straight line is a smooth transition section outside the exponential function curve and prevents stress concentration between rolls caused when a working roll makes contact with an intermediate roll under action of roll bending force; two flat roll sections are provided, wherein the first flat roll section is the section, making contact with a band steel body part, of the roll surface of the working roll, the second flat roll section is located at one end of the roll surface of the working roll, and the purpose is to improve the grinding precision and efficiency of the working roll. After curvilinear functions of all sections are determined, the curvilinear functions are expressed by sections. The working roll forming technology can effectively improve the cold-rolled electrical steel edge drop control level, improve the roll grinding precision and efficiency, reduce the roll consumption, and lower the cold-rolled electrical steel production cost.

Working roll forming technology taking grinding precision and cold-rolled electrical steel edge drop control into consideration

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 discloses a narrow edge wave control method of a six-roller CVC (Current-Voltage Characteristic) temper mill, which relates to flatness control in a steel rolling process and solves the problem of bad control over narrow edge waves by using an existing method. The method comprises the steps of performing optimal design on the roller shape of an intermediate roller of the six-roller CVC temper mill, performing optimal design on the roller shape of a working roller of the six-roller CVC temper mill, and acting the optimized intermediate roller and the optimized working roller on the side of strip steel together. The optimized intermediate roller and the optimized working roller are acted on the side of the strip steel together. According to the method, the roller shape of the intermediate roller and the roller shape of the working roller of the six-roller CVC temper mill are optimized, so that the leveling control capability of the six-roller CVC temper mill on the side of the thin wide strip steel can be increased, the narrow edge waves of the thin wide strip steel can be eliminated, the flatness quality of the strip steel after leveling is increased, and the defective rate caused by the defects of the narrow edge waves is reduced.

Narrow edge wave control method of six-roller CVC (Current-Voltage Characteristic) temper mill

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 roughness predication and control method for belt steel produced by an electric spark textured working roller On the basis of inter-interface minimum oil film thickness, electric spark textured working roller surface abrasion depth and abrasion surface roughness are obtained by the method, a relation of interface minimum oil film thickness, working roller abrasion depth and belt steel surface roughness provided by the invention can be used for predicating the surface roughness of the cold-rolled belt steel produced by the electric spark textured working roller; a belt steel surface roughness target interval and a roughness predication value are compared; if the roughness predication value is not in the belt steel surface roughness target interval, the rolling speed and the pressing rate are adjusted Compared with finite element method analysis and an empirical equation obtained by tracking and measuring the belt steel surface roughness, the method has the characteristics of rapid calculation speed and wide applicable range; the method considers the influences on a working roller surface abrasion and roughness copying process by inter-interface oil film distribution in a cold rolling process, and has higher predication precision

Roughness predication and control method for belt steel produced by electric spark textured working roller

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.

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

The invention discloses a method and a special device for measuring topography functional characteristic parameters of a roller and a strip steel three-dimensional surface. The method is used for reading the original outline value and can carry out data processing in the following steps of;(1) eliminating a shape error; (2) eliminating a waviness error; (3) correcting a singular point; (4) calculating a two-dimensional outline height distribution probability; (5) calculating a three-dimensional outline height distribution probability; and (6) obtaining an outline load-carry duty curved line according to the integral of the three-dimensional outline height distribution probability, and calculating a topography functional characteristic parameter of the three-dimensional surface according to loaded region distributed data. The method provided by the invention can measure the topography functional characteristic parameters of the roller and the strip steel three-dimensional surface in a production field, and the accuracy of a characterization roller and a strip steel pattern is improved; the method can fully represent the surface property of the characterization roller and the strip steel, an exactly moving objective table does not need, the measured time is short, and the device can resist the large interfere influencing the measurement.

Li Hongbo

Papers

Variable convexity working roll for rolling plates, sheets and strips

Roughness predication and control method for belt steel produced by electric spark textured working roller

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

Method and device for measuring topography functional characteristic parameters of roller and strip steel three-dimensional surface