CN-116571580-B - Pass calibration method for continuous rolling machine frame

CN116571580BCN 116571580 BCN116571580 BCN 116571580BCN-116571580-B

Abstract

The invention discloses a continuous rolling stand hole type calibration method, which relates to the technical field of steel pipe rolling and comprises the following steps of S1, zeroing a hydraulic cylinder and calibrating a center of a calibration table, S2, installing a calibration disc meter, S3, filling a gasket, S4, automatically calibrating, S5, correcting a hole type offline, S6, rechecking the hole type online, automatically calibrating contact between a roller and the calibration disc meter through zeroing the hydraulic cylinder and calibrating the center of the calibration table, and correcting hole type deviation in real time, thereby improving the accuracy and efficiency of calibration and ensuring the precision and consistency of the hole type online in a production line. Meanwhile, the deviation of the fitting degree of the calibrated disc gauge and the roller gap and the hydraulic small bin travel value is judged, the center of the calibrated hole pattern is consistent with the center of the actual working hole pattern, and the risk of uneven wall thickness of the rolled pierced billet is reduced.

Inventors

ZHU ZHILU
LIU JIANQUN
LIU ZHIWEI
XIAO GUOLIANG

Assignees

衡阳华菱钢管有限公司

Dates

Publication Date: 20260508
Application Date: 20230614

Claims (4)

1. The continuous rolling machine frame hole type calibration method is characterized by comprising the following steps of: s1, zeroing a hydraulic cylinder and correcting the center of a calibration table, S2, installing a calibration disc meter, S3, filling a gasket, S4, automatically calibrating, S5, correcting a hole pattern off line, S6, and rechecking an on-line hole pattern; In the step S2, installing a calibration disc meter corresponding to the frame, measuring levelness of the calibration disc meter by using a level meter, and correcting the levelness of the calibration disc meter to be within a range of 0-0.2 degrees; The calibrating disc used in the step S2 is in a theoretical hole pattern shape, and when the hole pattern of the frame to be checked in the step S5 is completely consistent with the designed hole pattern, the circular arcs of the R1 section and the R2 section of the calibrating disc meter can be completely attached to the circular arc in the middle of the roller; step S4, starting automatic calibration, wherein a hydraulic cylinder of a rack calibration table pushes a top sliding plate of a roller swing arm until a roller contacts a calibration disc meter arranged in the center of the calibration table; Step S5, measuring the gap between the calibration disc meter and the roller by using a feeler gauge, if the fit between the calibration disc meter and the edge of the roller is good, the gap is within 0.1mm, and the deviation of the travel values of three hydraulic small bins is less than 1mm, allowing the movement to a production line for rechecking; the formula according to which the dimensional relation between the gasket and the gap in the step S5 is based is as follows; ; Wherein the method comprises the steps of For the overall dimensions of the gasket, In order to be the size of the gap, A correction gasket value for ensuring that the hydraulic small bin travel deviation of the three rollers is smaller than 1 mm; And S6, pushing the calibrated stand into a continuous rolling mill housing, adjusting the stand to a working position, and then placing a rechecking standard part between rollers to test the actual pass, wherein if the rechecking standard part is well attached to the edges of the rollers, the production is allowed to be carried out, otherwise, the steps S1-S6 are repeated until the requirements are met.
2. A tandem mill stand hole pattern calibration method according to claim 1, wherein in step S1, the hydraulic cylinder on the stand calibration stand is adjusted to a zero value using a standard stand, and the center of the calibration stand is corrected.
3. A tandem mill stand hole pattern alignment method according to claim 1, wherein in step S3, after filling the roll base with the corresponding thickness shim plate compensating for the roll diameter variation, the stand is pushed into the stand alignment table.
4. A tandem mill stand hole pattern calibration method according to claim 1, wherein the reinspection standard is made in a design hole pattern shape.

Description

Pass calibration method for continuous rolling machine frame Technical Field The invention relates to the technical field of steel pipe rolling, in particular to a continuous rolling frame hole pattern calibration method. Background The cross-sectional shape of the rolled pierced billet depends on the space between the roll and the mandrel, while the pass of the roll restricts the flow of metal outside the pierced billet, affecting the uniformity of the wall thickness. The accuracy of the actual hole pattern is therefore critical to ensuring wall thickness accuracy. Currently, one conventional method is to calibrate the actual hole pattern using a polygonal disk gauge on a frame calibration table. The method is characterized in that the frame is directly put into use after the requirements are met by checking and adjusting the roll gap deviation and adjusting the frame according to the standard value of the hydraulic small bin travel. Another conventional method is to acquire a hole pattern image with a high-precision camera and compare it with a reference pattern. However, these two conventional methods have the following problems: When the polygonal disc meter is used for hole pattern calibration, as the contact between the polygonal disc meter and the roller is point contact, the disc meter can be locally deformed due to long-term pressing, the pressing position is changed, the deviation of the calibrated hole pattern is increased, the position deviation between the actual hole pattern and the theoretical design hole pattern can not be conveniently and accurately estimated and corrected through checking the roller gap after assembly, which means that the accurate calibration can not be carried out on site, and in addition, the method can not carry out the recheck of the actual working hole pattern on the frame by checking the roller gap under line to determine the hole pattern deviation. This can lead to the center of the actual working hole pattern being offset from the center of the calibrated hole pattern, which in turn can lead to uneven metal flow during rolling of the pierced billet, increasing the wall thickness non-uniformity of the pierced billet. The method for comparing the hole pattern image with the reference pattern by using the high-precision camera has higher equipment investment and maintenance cost and more complex installation process. Therefore, the invention provides a tandem rolling mill frame hole type calibration method for solving the problems in the background technology. Disclosure of Invention The present invention is directed to a method for calibrating a tandem rolling mill frame hole pattern, which solves at least one of the problems and drawbacks set forth in the background art. According to one aspect of the invention, a continuous rolling machine frame hole type calibration method is provided, which comprises the following steps of S1, hydraulic cylinder zeroing and calibration table center correction, S2, installation of a calibration disc meter, S3, filling of gaskets, S4, automatic calibration, S5, hole type correction under line, S6, hole type reinspection on line; Step S4 specifically comprises the steps of starting automatic calibration, pushing a top sliding plate of a roller swing arm by a hydraulic cylinder of a rack calibration table until a roller contacts with a calibration disc meter arranged in the center of the calibration table, and recording travel values of three hydraulic cabins at the moment; The step S5 specifically comprises the steps of measuring the gap between the calibration disc meter and the roller by using a feeler gauge, if the fit between the calibration disc meter and the edge of the roller is good, the gap is within the range of 0.1mm, and the deviation of the travel values of three hydraulic small bins is smaller than 1mm, the movement to the production line is allowed to be rechecked, otherwise, the gasket of the corresponding gap is filled or drawn under the roller base to correct the roller surface position until the position meets the requirement. Through the zero setting of the hydraulic cylinder and the center correction of the calibration table, the contact between the automatic calibration roller and the calibration disc meter and the real-time correction of the hole type deviation, the accuracy and the efficiency of the calibration are improved, and the precision and the consistency of the hole type on the production line are ensured. Meanwhile, the deviation of the fitting degree of the calibrated disc gauge and the roller gap and the hydraulic small bin travel value is judged, the center of the calibrated hole pattern is consistent with the center of the actual working hole pattern, and the risk of uneven wall thickness of the rolled pierced billet is reduced. The method comprises the further scheme that step S6 comprises the steps of pushing the calibrated stand into a continuous rolling mill housing, adjusting the stand to a