CN-122007170-A - Method for precisely controlling length of finished tail ruler of hot rolled bar

CN122007170ACN 122007170 ACN122007170 ACN 122007170ACN-122007170-A

Abstract

The invention belongs to the technical field of steel rolling, and particularly relates to a method for precisely controlling the length of a finished tail ruler of a hot rolled bar. The method comprises the steps of calculating the number of the fixed-length sections and calculating the tail length of the finished hot rolled bar. The method for precisely calculating the tail ruler is used for calculating the tail ruler of the rolled material corresponding to each specification of casting blank, reasonably optimizing and combining, reducing the number of blank types to the maximum extent and ensuring the production. And (3) the production is carried out according to the calculated blank reorganization, so that waste products caused by short-length materials of the tail ruler are avoided, and the actual yield of each specification of the rolled materials is kept at a good level.

Inventors

WANG ZONGBIN
ZHANG LILI
YAN HAN
LI JUN
LIN MIN
LIU JINLING

Assignees

山东钢铁股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (9)

1. The method for precisely controlling the length of the finished tail ruler of the hot rolled bar is characterized by comprising the following steps of: (1) Calculating the number of the fixed-length segments: calculating the number of the obtained fixed-length segments according to a formula ①; Number of fixed-length segments = ,①; In equation ①, the actual weight of the billet = the actual measured length of the billet x the actual meter weight of the billet; (2) Calculating the length of a tail of the finished hot rolled bar: tail length = fractional part of the number of cut length calculated in step (1 x actual length of cut length).
2. The method for precisely controlling the length of the finished tail length of the hot rolled bar according to claim 1, wherein the actual meter weight of the blank in the step (1) is obtained by extracting 50 heats according to the rolling line rolling specification, extracting 10 bundles of steel materials per heat, 30 steel materials per bundle, sizing 6 meters, and calculating the actual weight of the blank per meter according to the weighing actual weight.
3. The method for precisely controlling the length of the finished tail of the hot rolled bar according to claim 1, wherein the yield in the step (1) is=100% -the rolling line oxidation loss coefficient-the cutting loss coefficient, and the oxidation loss coefficient and the cutting loss coefficient are percentages.
4. The method for precisely controlling the length of a finished tail of a hot rolled bar according to claim 3, wherein the rolling line oxidation loss coefficient is obtained by tracking production data, and is specifically as follows: The monthly oxidation loss rate of the rolling line was tracked and counted, and monthly oxidation loss rate= ; And counting the production data of the monthly oxidation burning loss rate for two years, and taking an average value to obtain the rolling line oxidation burning loss coefficient.
5. The method for precisely controlling the length of a finished tail of a hot rolled bar according to claim 3, wherein the cutting loss coefficient is obtained by tracking production data, and is specifically as follows: Tracking and counting the monthly cutting loss rate, wherein the monthly cutting loss rate is = ; And counting the production data of the monthly cutting loss rate for one year, and taking an average value to obtain the cutting loss coefficient.
6. The method for precisely controlling the length of a finished tail of a hot rolled bar according to claim 5, wherein the weight of the large shear head of the rolled bar=the length of the head cut×the cross-sectional area of the rolled bar×the density of the steel material; Large shear tail weight of rolled stock = tail length x cross sectional area of rolled stock x steel density.
7. The method of claim 1, wherein the yield rate in step (1) =actual yield rate in steady production state, wherein the production data of one year of steel is selected according to the rolling line rolling specification, and the actual yield rate = 。
8. The method for precisely controlling the length of a finished tail of a hot rolled bar according to claim 1, wherein the actual rice weight of the finished product in the step (1) is obtained by the following steps: First, calculating actual rice unit weight of each bundle of finished products in the extracted sample, wherein: Actual rice weight per bundle of finished products = ; And then, taking an average value to obtain the actual rice weight of the finished product.
9. The method for precisely controlling the length of the finished tail of the hot rolled bar according to claim 1, wherein the actual length of the fixed length in the step (1) and the step (2) is the actual average level of the fixed length control, and the method is obtained by tracking and measuring production data, and is specifically as follows: Firstly, in the production process, extracting 50 heats according to the rolling specification of a rolling line, and setting the fixed length to be 6 meters during hot shearing; And then, after cooling, measuring the actual length, and taking an average value to obtain the fixed-length actual length.

Description

Method for precisely controlling length of finished tail ruler of hot rolled bar Technical Field The invention belongs to the technical field of steel rolling, and particularly relates to a method for precisely controlling the length of a finished tail ruler of a hot rolled bar. Background In the steel rolling production process, after plastic processing of the blanks by a multi-frame rolling mill, the blanks need to be subjected to head cutting and tail cutting, and the blanks are cut into required fixed length sections according to the requirements of users, so that the yield and the fixed length rate are two key technological indexes for bar production. In the normal production process, the production links influencing the yield and the fixed-length rate have the following aspects: (1) Billet weight stabilization, which is to control continuous casting currently through a sizing and weight-fixing equipment system depending on the control level of casting billets in a steelmaking workshop. (2) The heating burning loss is a fixed value depending on the equipment structure, heating capacity and heating process system of the workshop heating furnace. (3) The shearing loss in the middle process can be controlled to be a fixed value under the condition of ensuring the shortest length of the head and the tail and stable equipment on the premise of meeting the rolling stability. (4) And if the cutting loss of the finished product is minimum, only one section of tail ruler needs to be ensured after the end and the tail of the finished product are cut, and the length of the tail ruler meets the standard requirement, so that the length of the finished product tail ruler needs to be accurately calculated and controlled. According to the conditions, blank weight stability control, heating burning loss and intermediate process flying shear loss are controllable items, and the key of the problem is how to accurately calculate and control the length of a finished tail ruler, so that the minimum cutting loss of the finished product is ensured, and the length of the final specified ruler is ensured to meet the requirements. For the calculation of the length of the tail length of the rolled piece, a calculation method of volume conversion or weight conversion is generally adopted. Volume conversion follows the law of constant volume, namely billet volume=cuboid volume, and rolled material volume=cylinder volume. The weight conversion is based on the actual weight of the blank after weighing. The weight of the rolled material is based on the length of the steel and (5) calculating the theoretical rice weight of the X national standard. In the actual production process, the theoretical length calculated by the two methods has larger deviation from the actual length, and can not play a role in guiding production, because the weight base is different when the volume is calculated due to the different densities of the blank and the material, and the calculation result is influenced. The deviation between theoretical rice weight and actual rice weight of the finished product material is large, and the basic size of the hole pattern design and the control habit of the actual operation of the post and the density of steel types and the like have certain influence on the actual rice weight. The actual size of the end face and the theoretical size have errors because the section of the blank is affected by the abrasion of the crystallizer of the continuous casting machine. The actual meter weight of the steel has errors under the influence of the shrinkage coefficient of the steel and the influence of the dimension control during rolling. Disclosure of Invention The invention aims to provide a method for precisely controlling the length of the tail ruler of a finished hot-rolled bar product aiming at the defects, which tracks the actual production condition, combines actual production data, and can precisely calculate and control the length of the tail ruler of the finished hot-rolled bar product, thereby ensuring that the cutting loss of the finished product is minimum, ensuring that the length of the tail ruler of the finished product can be controlled to be 4-6 meters, and reducing short-length waste products. The control method has the advantages of small error and strong operability, can meet actual production requirements, and provides technical support for improving technical indexes and realizing maximization of economic benefits. The technical scheme of the invention is that the method for precisely controlling the length of the finished tail ruler of the hot rolled bar comprises the following steps: (1) Calculating the number of fixed-length segments: firstly, calculating the number of the fixed-length segments according to a formula ①; Number of fixed-length segments = Formula ①. In equation ①, the actual billet weight=the actual billet length×the actual billet meter weight. The actual weight of the blank per meter is obt