A method for improving the quality of a cold-rolled strip steel

Abstract

The application is a method for improving the quality of cold-rolled strip steel, comprising the following steps: segmenting the water beam according to a certain distance interval on the side of the outer surface of the water beam in contact with the strip steel, and performing cycle baking and heating on each segment of the water beam at a speed of 30s per round from the head to the tail of the segment, and stopping heating when the length of the two wing ends of each segment of the water beam extends outward by 0.5mm, and the part of 3cm expanded to the left and right sides of the intersection of the two segments of the water beam is used as a reinforcing section, and the reinforcing section is baked and heated by gradually reducing the heating temperature, and the bottom surface of the reinforcing section is uniformly heated, and the two side wings of the reinforcing section are expanded outward by 1mm; the application optimizes the link of the strip steel by reforming the water beam, prevents the accumulation effect in the middle part of the water beam, makes the deformation meet the requirements of the frame-span strip steel, avoids the water beam black print of the strip steel, and improves the quality of the cold-rolled strip steel.

Description

Technical Field

[0001] This invention relates to the field of cold-rolled strip steel technology, and in particular to a method for improving the quality of cold-rolled strip steel for various applications. Background Technology

[0002] Currently, cold-rolled strip steel products are mainly used by downstream manufacturers for welding steel pipes and cold rolling. With the requirements of development, downstream manufacturers and customers are constantly increasing their demands for product quality. In particular, the quality requirements for cold-rolled strip steel, such as appearance quality, plate shape quality, surface quality, dimensional tolerance control, and precision, have reached new heights. Traditional cold-rolled strip steel has the problem of watermarks and black marks, resulting in low quality of cold-rolled strip steel. Summary of the Invention

[0003] The purpose of this invention is to provide a method for improving the quality of cold-rolled strip steel to solve the above problems.

[0004] The objective of this invention is achieved through the following technical solutions:

[0005] 1. A method for improving the quality of cold-rolled strip steel, comprising the following steps:

[0006] S1: Divide the water beam into sections at a certain distance on the outer surface of the contact strip. Heat each section of water beam in a cycle of 30 seconds from the head to the tail. Stop heating when the two ends of each water beam extend outward by 0.5 mm. Take the part at the intersection of two water beam sections and extend 3 cm to the left and right as the reinforcing section. Heat the reinforcing section by gradually decreasing the heating temperature. Heat the bottom surface of the reinforcing section evenly until the two wings of the reinforcing section expand outward by 1 mm.

[0007] S2: Stop the water beam heating operation, fix the water beam, and use a hammer to strike the two wing plates of the water beam. The distance between the hammer head and the wing plate of the water beam is 5cm. The striking points are evenly distributed on the two wing plates of the water beam every 3cm along the central axis of the wing plate. The wing plate on one side is struck in a skipping manner with a striking point every other time. After the wing plate on one side is struck from beginning to end, the remaining striking points are struck from beginning to end again. The striking method is that the hammer head moves around the tail of the hammer handle in a uniform pure rotation manner, and the hammer head collides with the striking point at a certain angle. The striking points of the reinforced section in step S1 are struck 5 times, and the remaining parts are struck 3 times.

[0008] S3: The water beam bottom plate is struck by hammering. The striking points are evenly distributed at certain intervals along the central axis of the bottom plate. The distance between the hammer head and the water beam bottom plate is 1cm. The striking method is that the hammer head moves around the center of gravity of the hammer handle in a uniform pure rotation. The hammer head collides with the striking point at a certain angle. Each striking point is struck twice in sequence.

[0009] Preferably, the segment distance in step S1 is 15cm.

[0010] Preferably, the collision angle in step S2 is 20°.

[0011] Preferably, in step S3, the striking points are evenly distributed every 1 cm along the central axis of the base plate.

[0012] Preferably, the collision angle in step S3 is 15°.

[0013] Preferably, the system employs AGC hydraulic pressing control and AWC+SSC control; a SINAMICS DCM6RA80 series fully digital speed control system; intelligent control (automatic rolling load distribution, rolling force self-learning system, temperature self-learning system), Siemens WinCC monitoring software, and roll wear and thermal expansion model compensation functions; and pressure-bearing integrated metallurgical wastewater purification treatment technology to perform testing operations on the cold-rolled strip steel after the water beam treatment.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. This invention adopts AGC hydraulic pressing control and AWC+SSC control; it uses the SINAMICS DCM6RA80 series fully digital speed regulation system; intelligent control (automatic distribution of rolling load, self-learning system of rolling force, self-learning system of temperature), Siemens WinCC monitoring software, roll wear and thermal expansion model compensation function; and pressure-bearing integrated metallurgical wastewater purification treatment technology to conduct high-standard testing of strip steel quality.

[0016] 2. This invention uses a water beam modification method to optimize the strip steel process, preventing the accumulation effect in the middle of the water beam, ensuring that its deformation just meets the requirements of the strip steel span, avoiding the formation of water beam black marks on the strip steel, and improving the quality of cold-rolled strip steel. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a method for improving the quality of cold-rolled strip steel, comprising the following steps:

[0019] S1: Divide the water beam into sections at 15cm intervals on the outer surface of the contact strip. Circulate the water beam through each section for 30 seconds from head to tail. Stop heating when the two ends of each section extend outwards by 0.5mm. Take the section at the intersection of two sections and extend 3cm to the left and right as the reinforcing section. Heat the reinforcing section by gradually decreasing the heating temperature, heating the bottom surface of the reinforcing section evenly until the two wing plates on both sides of the reinforcing section expand outwards by 1mm. This step ensures that the water beam is heated evenly inside, ensuring that the entire water beam is heated evenly and sufficiently to deform. It also ensures that the intersection of two sections absorbs enough heat and expands to both sides due to secondary heating, preventing a buildup effect in the middle of the water beam.

[0020] S2: Stop the water beam heating operation, fix the water beam, and use a hammer to strike the two wing plates of the water beam. The distance between the hammer head and the wing plate of the water beam is 5cm. The striking points are evenly distributed on the two wing plates of the water beam every 3cm along the central axis of the wing plate. The wing plate on one side is struck in a skipping manner with a striking point every other time. After the wing plate on one side is struck from beginning to end, the remaining striking points are struck again from beginning to end. The striking method is that the hammer head moves around the tail of the hammer handle at a uniform speed, and the hammer head collides with the striking point at a 20° angle. The striking points of the reinforced section in step S1 are struck 5 times, and the rest are struck 3 times. By using a skipping striking method and a hammer head rotating around the tail of the hammer at a uniform speed, and setting a 20° striking angle, the deformation of the two wing plates is controlled, so that the deformation just meets the requirements of the span steel.

[0021] S3: The bottom plate of the water beam is struck by hammering. The striking points are evenly distributed every 1cm along the central axis of the bottom plate. The distance between the hammer head and the bottom plate of the water beam is 1cm. The striking method is that the hammer head moves around the center of gravity of the hammer handle in a uniform pure rotation. The hammer head collides with the striking point at a 15° angle. Each striking point is struck twice in sequence. This step avoids the formation of black marks on the water beam on the strip steel.

[0022] It adopts AGC hydraulic pressing control and AWC+SSC control; it uses the SINAMICS DCM 6RA80 series fully digital speed regulation system; intelligent control (automatic rolling load distribution, rolling force self-learning system, temperature self-learning system), Siemens WinCC monitoring software, roll wear and thermal expansion model compensation function; and pressure-bearing integrated metallurgical wastewater purification treatment technology to perform testing operations on cold-rolled strip steel after water beam treatment.

Claims

1. A method for improving the quality of cold-rolled strip steel, characterized in that: Includes the following steps: S1: Divide the outer surface of the water beam that contacts the strip steel into segments at a certain distance. Heat each water beam segment in a cycle of 30 seconds from the head to the tail. Stop heating when the two ends of each water beam segment extend outward by 0.5 mm. Take the part at the intersection of two water beam segments that extends 3 cm to the left and right as the reinforcing segment. Heat the reinforcing segment by gradually decreasing the heating temperature. Heat the bottom surface of the reinforcing segment evenly until the two wings of the reinforcing segment expand outward by 1 mm. S2: Stop the water beam heating operation, fix the water beam, and use a hammer to strike the two wing plates of the water beam. The hammer head is 5cm away from the wing plate of the water beam. The striking points are evenly distributed on the two wing plates of the water beam every 3cm along the central axis of the wing plate. The wing plate on one side is struck in a skipping manner with a striking point every other time. After the wing plate on one side is struck from beginning to end, the remaining striking points are struck from beginning to end again. The striking method is that the hammer head moves around the tail of the hammer handle in a uniform pure rotation manner, and the hammer head collides with the striking point at a certain angle. The striking points of the reinforced section in step S1 are struck 5 times, and the remaining parts are struck 3 times. S3: The water beam base plate is struck by hammering. The striking points are evenly distributed at certain intervals along the central axis of the base plate. The hammer head is 1cm away from the water beam base plate. The striking method is that the hammer head moves around the center of gravity of the hammer handle in a uniform pure rotation. The hammer head collides with the striking point at a certain angle. Each striking point is struck twice in sequence.

2. The method for improving the quality of cold-rolled strip steel according to claim 1, characterized in that: The segment distance in step S1 is 15cm.

3. The method for improving the quality of cold-rolled strip steel according to claim 1, characterized in that: The collision angle in step S2 is 20°.

4. The method for improving the quality of cold-rolled strip steel according to claim 1, characterized in that: In step S3, the striking points are evenly distributed every 1 cm along the central axis of the base plate.

5. The method for improving the quality of cold-rolled strip steel according to claim 1, characterized in that: The collision angle in step S3 is 15°.