Bar head cutting detection control method

Abstract

The invention discloses a bar head cutting detection control method which comprises the following steps: step 1, firstly, using billets with different section specifications, rolling the billets through six rough rolling mills respectively, rolling the sections of the billets into standard round material types when the billets leave the last rough rolling mill, and rolling the sections of the billets into standard round material types when the billets leave the last rough rolling mill; establishing a unified standard material type as a reference basis; 2, a scanner is additionally arranged between the last rolling mill for rough rolling and the first rolling mill for intermediate rolling and in front of the flying shear, the size of the head of the steel billet is detected in real time through the scanner, then the size is compared with the reference standard, and the deviation value between the two is obtained; 3, the deviation value is compared with a preset threshold value to judge whether the steel billet head has defects or not, if not, the flying shear is not triggered to act, and the steel billet head completely passes through and enters the next procedure; if the defects exist, a shearing instruction is sent to the flying shear. According to the method, unnecessary waste is reduced, and the yield is greatly increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bar production, in particular to a bar head cutting detection control method. BACKGROUND

[0002] In the bar and wire production line, between rough rolling, intermediate rolling and finish rolling, the rough rolling mill is generally arranged as 6 rolling mills (adopting a flat and vertical alternating arrangement mode), which requires setting a flying shear to cut the head of the billet to eliminate the cracking defects of the head and tail caused by stress concentration. However, the above defects do not exist in every billet, so in the existing production process, in order to ensure smooth production, every billet is cut, which causes a certain waste of most billets without defects due to head cutting.

[0003] In order to reduce the above waste, the shorter the head cutting length is under the premise of ensuring smooth production, the higher the yield is, and the more beneficial to cost reduction. The head and tail mainly concentrate between the last rolling mill of rough rolling and the first rolling mill of intermediate rolling, which accounts for the largest weight of the head. Therefore, how to predict the head cracking defect situation in advance before cutting and set the program according to the actual situation to determine whether to cut and the cutting length to improve the yield has become a difficult problem to be solved at present. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a bar head cutting detection control method, which can accurately check whether the head of the billet has defects, and then compare with the reference benchmark to determine whether to perform cutting operation. This process not only avoids the problem of incomplete cutting, but also enables the head of the billet to pass through the next process completely without being cut when there is no need to cut, thereby avoiding the phenomenon of cutting due to the head cracking and other problems, reducing unnecessary waste, and greatly improving the yield.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: the bar head cutting detection control method of the present application, the innovation point of which comprises the following steps: Step 1: first use billets with different cross-sectional specifications, which are respectively rolled through 6 rough rolling mills, and when leaving the last rolling mill of rough rolling, the cross sections are respectively rolled into standard round material shapes, and a unified standard material shape is established as a reference benchmark; Step 2: a scanner is additionally arranged between the last rolling mill of rough rolling and the first rolling mill of intermediate rolling and before the position of the flying shear, and the head size of the billet is detected in real time by the scanner, and then compared with the above reference benchmark to obtain the deviation value between them; Step 3: Compare the above deviation value with the preset threshold to determine whether there is a defect at the head of the billet. If there is no defect, the flying shear action will not be triggered, allowing the billet head to pass through completely and enter the next process; if there is a defect, a shearing command will be issued to the flying shear.

[0006] Preferably, in step one above, different specifications of steel billets are used according to the different equipment capacities, and the steel billets used have a cross-sectional dimension of 150 cm. 2 ~170cm 2 The square billet.

[0007] Preferably, in step one above, the six roughing mills are arranged in an alternating horizontal and vertical manner, and a specific die setting of horizontal-horizontal-elliptical-circular-elliptical-circular is adopted. Through this series of standardized deformation processes, it is ensured that the steel billet is rolled into a standard circular shape when it leaves the last roughing mill.

[0008] Preferably, in step two above, the scanner uses a real-time, online non-contact measurement method to detect the actual size of the billet head contour in real time, and compares the continuously acquired billet head measured data with the reference benchmark. If the billet head has defects due to stress concentration, its head contour size will inevitably be abnormal, and the deviation value between the billet head size and the reference benchmark can be obtained during the comparison process.

[0009] Preferably, in step three above, the preset threshold is ±1.5mm, and when the deviation between the billet head size and the reference datum is less than 1.5mm, it is determined that the billet head has no cracking defects. At this time, the flying shear action is not triggered, and the billet head passes through completely and enters the next process.

[0010] Preferably, when the deviation between the billet head size and the reference datum is greater than 1.5mm, it is determined that there is a defect in the billet head that needs to be removed, and a cutting command is immediately sent to the flying shear.

[0011] Preferably, the basis for determining the length of the portion of the billet head to be cut is: cutting is performed after a time T elapses after the flying shear receives the cutting command, and T = l / V + L / V ;in, l The length of the billet head that does not meet the standard; L This refers to the distance between the last mill stand in the roughing mill and the flying shear. V This refers to the speed of the last mill in the roughing process.

[0012] The beneficial effects of this invention are as follows: This invention can accurately inspect whether there are defects in the head of the steel billet, and then compare it with a reference standard to determine whether shearing is necessary. This process can not only avoid the problem of incomplete shearing, but also allow the head of the steel billet to pass through completely and enter the next process when shearing is not necessary, avoiding the phenomenon of shearing without problems such as head cracking, thereby reducing unnecessary waste and greatly improving the yield. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the principle of bar cutting detection and control of the present invention.

[0015] Figure 2 This is a schematic diagram showing the position of the scanner in this invention.

[0016] Figure 3 This is a schematic diagram of the part that needs to be cut in this invention.

[0017] Figure 4 This is a die pattern diagram of the first roughing mill of the present invention.

[0018] Figure 5 This is a die pattern diagram of the second stand of the roughing mill in this invention.

[0019] Figure 6 This is a die pattern diagram of the third stand of the roughing mill in this invention.

[0020] Figure 7 This is a die pattern diagram of the fourth stand of the roughing mill in this invention.

[0021] Figure 8 This is a die pattern diagram of the fifth stand of the roughing mill in this invention.

[0022] Figure 9 This is a die pattern diagram of the sixth stand of the roughing mill in this invention. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0024] The present invention provides a method for detecting and controlling the cutting of bar stock, comprising the following steps: Step 1: First, steel billets with different cross-sectional specifications are rolled through 6 roughing mills. When leaving the last roughing mill, the cross-section is rolled into a standard circular shape, and a unified standard shape is established as a reference.

[0025] In the above steps, different specifications of steel billets are used depending on the capacity of the equipment, and the steel billets used have a cross-sectional dimension of 150 cm. 2 ~170cm 2 The square billet.

[0026] In the above steps, the six roughing mills are arranged in an alternating horizontal and vertical manner, and a specific die setting of horizontal-horizontal-elliptical-circular-elliptical-circular is adopted. Through this series of standardized deformation processes, it is ensured that the steel billet is rolled into a standard circular shape when it leaves the last roughing mill.

[0027] Step 2: A scanner is installed between the last stand of the roughing mill and the first stand of the intermediate mill, at a position relative to the position before the flying shear. The size of the billet head is detected in real time by the scanner, and then compared with the above reference benchmark to obtain the deviation value between the two.

[0028] In the above steps, the scanner uses a real-time, online non-contact measurement method to detect the actual size of the billet head contour in real time and compares the continuously acquired billet head measured data with the reference benchmark. If the billet head has defects due to stress concentration, its head contour size will inevitably be abnormal. The deviation value between the billet head size and the reference benchmark can be obtained during the comparison process.

[0029] Step 3: Compare the above deviation value with the preset threshold to determine whether there is a defect at the head of the billet. If there is no defect, the flying shear action will not be triggered, allowing the billet head to pass through completely and enter the next process; if there is a defect, a shearing command will be issued to the flying shear.

[0030] In the above steps, the preset threshold is ±1.5mm. When the deviation between the billet head size and the reference datum is less than 1.5mm, it is determined that the billet head has no cracking defects. At this time, the flying shear action is not triggered, and the billet head passes through completely and enters the next process. When the deviation between the billet head size and the reference datum is greater than 1.5mm, it is determined that the billet head has defects that need to be removed. At this time, a cutting command is immediately issued to the flying shear.

[0031] The basis for determining the required length of the steel billet head to be cut in this invention is: cutting is performed after a time T elapses after the flying shear receives the cutting command, and T = l / V + L / V ;in, l The length of the billet head that does not meet the standard; LThis refers to the distance between the last mill stand in the roughing mill and the flying shear. V This refers to the speed of the last mill in the roughing process.

[0032] Example Assuming the production of Φ20 and Φ25mm round steel, through the die optimization in step one above, the theoretical diameter of the standard material exiting the roughing mill is 80.0mm (in reality, even if the exit size is different, as long as it is round, the parameters can be set separately. However, generally speaking, in the actual bar production process, the number of stands and the material type are basically the same or similar in roughing and intermediate rolling, thereby reducing the need for spare parts adjustment and replacement. The changes are concentrated in the finishing rolling area because the mill is easy to replace in the finishing rolling area). Therefore, based on the preset threshold of ±1.5mm, the diameter within the range of 78.5mm to 81.5mm can be considered as normal fluctuation. At this time, the scanner determines whether there are defects at the head of the billet, which falls into the following two scenarios: 1) There are no defects at the head of the steel billet. After a steel billet undergoes rough rolling, its actual head size is detected by a scanner. The detection results show that the head diameter fluctuates between 79.8 mm and 80.3 mm. Since all data points do not exceed the preset threshold of ±1.5 mm, it is determined that there is no cracking defect in the head of the steel billet. At this time, the flying shear does not operate, and the head of the steel billet is completely preserved and enters the intermediate rolling process, thereby improving the yield.

[0033] 2) Defects exist at the head of the steel billet. After a steel billet undergoes rough rolling, its actual head dimensions are detected by a scanner. The detection results show that there is an abnormal diameter data in a section approximately 0.3m long: some data is below 78.5mm (e.g., 77.8mm), indicating possible dents caused by cracking; other data is above 81.5mm (e.g., 82.0mm), indicating possible bulges caused by peeling. In other words, the dimensional deviation of this area exceeds the preset threshold of ±1.5mm, indicating that there is a defect in the head of the steel billet that needs to be removed. At this point, a shearing command is immediately issued to the flying shear, which is precisely activated when it reaches the defective area of ​​the steel billet, cutting off only the 0.3m long defective section. After the shearing is completed, the flying shear stops working, and the remaining part of the steel billet (including the intact parts before and after the defective area) continues to advance into the intermediate rolling process.

[0034] The beneficial effects of this invention are as follows: This invention can accurately inspect whether there are defects in the head of the steel billet, and then compare it with a reference standard to determine whether shearing is necessary. This process can not only avoid the problem of incomplete shearing, but also allow the head of the steel billet to pass through completely and enter the next process when shearing is not necessary, avoiding the phenomenon of shearing without problems such as head cracking, thereby reducing unnecessary waste and greatly improving the yield.

[0035] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A method for detecting and controlling the cutting of bar stock, characterized in that... Includes the following steps: Step 1: First, steel billets with different cross-sectional specifications are rolled through 6 roughing mills. When they leave the last roughing mill, their cross-sections are rolled into standard circular shapes. This standard shape is then used as a reference benchmark. Step 2: A scanner is installed between the last stand of the roughing mill and the first stand of the intermediate mill, and at a position before the flying shear. The size of the billet head is detected in real time by the scanner, and then compared with the above reference benchmark to obtain the deviation value between the two. Step 3: Compare the above deviation value with the preset threshold to determine whether there is a defect at the head of the billet. If there is no defect, the flying shear action will not be triggered, allowing the billet head to pass through completely and enter the next process; if there is a defect, a shearing command will be issued to the flying shear.

2. The bar cutting head detection and control method according to claim 1, characterized in that: In step one above, different specifications of steel billets are used depending on the capacity of the equipment, and the steel billets used have a cross-sectional dimension of 150 cm. 2 ~170cm 2 The square billet.

3. The bar cutting head detection and control method according to claim 2, characterized in that: In step one above, the six roughing mills are arranged in an alternating horizontal and vertical manner, and a specific die setting of horizontal-horizontal-elliptical-circular-elliptical-circular is adopted. Through this series of standardized deformation processes, it is ensured that the steel billet is rolled into a standard circular shape when it leaves the last roughing mill.

4. The bar cutting head detection and control method according to claim 1, characterized in that: In step two above, the scanner uses a real-time, online, non-contact measurement method to detect the actual size of the billet head contour in real time and compares the continuously acquired billet head measured data with the reference benchmark. If the billet head has defects due to stress concentration, its head contour size will inevitably be abnormal, and the deviation value between the billet head size and the reference benchmark can be obtained during the comparison process.

5. The bar cutting head detection and control method according to claim 1, characterized in that: In step three above, the preset threshold is ±1.5mm. When the deviation between the billet head size and the reference datum is less than 1.5mm, it is determined that the billet head has no cracking defects. At this time, the flying shear action is not triggered, and the billet head passes through completely and enters the next process.

6. The bar cutting head detection and control method according to claim 5, characterized in that: When the deviation between the billet head size and the reference datum is greater than 1.5mm, it is determined that there is a defect in the billet head that needs to be removed, and a cutting command is immediately issued to the flying shear.

7. The bar cutting head detection and control method according to claim 6, characterized in that: The basis for determining the length of the billet head to be cut is: cutting is performed after a time T elapses after the flying shear receives the cutting command, and... T = l / V + L / V ; in, l The length of the billet head that does not meet the standard; L This refers to the distance between the last mill stand in the roughing mill and the flying shear. V This refers to the speed of the last mill in the roughing process.

Images