A method for rolling high-grade silicon steel weld without punching

Abstract

The present invention relates to the fields of electricity and metallurgy, and in particular to a method for rolling high-grade silicon steel welds without punching. A method for rolling high-grade silicon steel welds without punching, comprising the following steps: step one: "one selection", step two: "two looks", step three: "three presses", step four: "four adjustments". The beneficial effects of the present invention are: 1. It meets the measurement accuracy requirements, meets the process requirements, and provides a strong technical guarantee for the production of silicon steel for continuous rolling mills. 2. The scheme adopts a low-cost design, has high operating stability, and meets the measurement accuracy standards. If it is promoted and used, it will save a lot of equipment costs for the user unit, conform to the principle of reducing costs and increasing efficiency, and has great promotion value.

Description

Technical Field

[0001] The invention relates to the fields of electricity and metallurgy, and in particular to a method for rolling high-grade silicon steel welds without punching. Background Art

[0002] The continuous rolling mill is a continuous line that rolls without stopping, and requires sufficient loops. When rolling, the pickling welder welds the two coils in advance to ensure continuous rolling of the mill. A whole coil is counted from the completion of welding by the welder to the detection of the weld at the entrance of the mill. The mill has a total of five stands, namely the first stand, the second stand, the third stand, the fourth stand and the fifth stand. During the rolling process, the actual position positioning accuracy of the welding point of the mill is strict. The rolling relies on the bending and shifting rollers to achieve the product thickness. Under normal circumstances, when the welding point reaches the entrance of the mill, the bending and shifting rollers need to shift to zero position to ensure that the welding point of the tail of the strip can pass through the mill smoothly. Once the weld detection fails, coupled with defects in welding, the bending and shifting rollers do not shift to zero position, then the mill will roll with normal rolling force, which is very easy to crack the weld, and eventually cause a belt break accident. Therefore, it can be seen that weld detection plays a vital role in the normal rolling of the continuous line, and high precision is required.

[0003] The weld point is tracked from the moment the welder completes the welding process until the strip is cut into products. Principle: During the welding process, a hole needs to be punched in the strip so that the position of the moving strip in the pickling mill can be determined by detecting the hole. To achieve this function, there are 5 weld point detectors, also known as physical weld point detectors, in the whole line. For convenient data collection, it is not enough to have functional physical WPDs (Weld Point Detector). Therefore, pseudo logical points or logical point detectors must be defined in the tracking system. In the actual weld point, the strip length is detected by physical or logical WPDs. The length of the strip is calculated by the number of pulses (PLG) of the pulse generator. The PLC system performs the tracking function and informs the secondary computer about the strip length, the position in the loop and the strip length. In the total of 24 tracking points or weld detectors, it is assumed that there is only one section of steel strip between two tracking points, and there are a total of 24 sections of steel strip in the whole line. The 24 tracking points are divided into 5 physical detection points and 19 logical detection points. Summary of the invention

[0004] The purpose of the present invention is to provide a method for rolling high-grade silicon steel welds without punching in view of the above problems.

[0005] The object of the present invention is achieved as follows: a method for rolling high-grade silicon steel welds without punching, comprising the following steps: Step 1: "One selection": the welding machine is at the pickling entrance, and the production operator is required to select the "NO PUNTCH" mode, that is, the "no punching mode" on the welding machine operation box after the operation of using the laser welder to weld the head and tail of the high-grade silicon steel strip is completed; Step 2: "Two inspections": First, after the welding is completed, the production operator at the pickling main operating table needs to check whether the weld has defects to prevent the defective weld from entering the rolling mill and causing the steel strip to be torn due to loose welding; Second, at the tension straightening machine, the production operator needs to pay attention to the method of reducing the fast opening and breaking of the acid continuous rolling tension straightening machine: the opening point of the tension straightening machine is compensated and corrected by opening the distance compensation value, and the closing point of the tension straightening machine is compensated and corrected by closing the distance compensation value, so that the strip weld The seam is located exactly between the opening and closing points of the tension straightening machine to avoid strip breakage at the weld position; the production operator of the disc shear operating table needs to observe whether there are acid spots caused by excessive acid on the surface of the strip after pickling in the pickling tank, and at the same time, it is necessary to observe whether there are cracks on the edge of the strip after the disc shearing edge, and deal with it in time to prevent it from entering the rolling mill and causing strip breakage; Step 3: "Three Presses": A set of weld manual confirmation device is set at the entrance of the rolling mill, 1. Switch mode: When rolling high-grade silicon steel, press the selection device input button on the weld manual confirmation device, and when rolling medium and low-grade silicon steel, press the selection device input button on the weld manual confirmation device. Switch back to the initial state; 2. Weld confirmation button: When the production operator observes that the weld is below the 5# weld detection device at the entrance of the rolling mill, he immediately presses the confirmation button. Since the weld hole detection is a pulse signal, the production operator will delay 0.1″ after pressing the confirmation button, and the button will automatically reset; 3. The manual weld confirmation device is designed with a weld confirmation completion warning light. When the warning light changes from green to red, it means that the weld confirmation action is completed, and the 10″ warning light returns to the initial state; Step 4: "Four adjustments": After the weld confirmation action is completed, the production operator on the main console of the rolling mill can The alarm information of the weld entering the rolling mill is seen on the HMI alarm screen. At this time, weld tracking begins. Before entering the frame, the production worker needs to make a slight adjustment to the rolling parameters. Due to the use of wire welding process, the weld thickness is 10%-20% higher than the parent material. When entering the rolling mill, the rolling load fluctuates greatly and is unstable. Therefore, when the weld enters the first to fifth frames in turn, lightly click the roll gap opening button to reduce the rolling load fluctuation when the weld passes through the frame. At the same time, select the weld quick opening mode to quickly move the shifting rollers of the first and second frames to both sides of the strip to reduce the stress effect at the welding point of the steel strip.

[0006] Furthermore, when rolling high-grade silicon steel, the plate shape control mode only uses emulsion point cooling control and leveling control mode to avoid the use of bending and shifting roll control.

[0007] The beneficial effects of the present invention are as follows: 1. It meets the measurement accuracy requirements and the process requirements, and provides a strong technical guarantee for the production of silicon steel for continuous rolling mills. 2. The scheme adopts a low-cost design, has high operating stability, and meets the measurement accuracy standards. If it is promoted and used, it will save a lot of equipment costs for the user unit, which is in line with the principle of reducing costs and increasing efficiency, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further described below in conjunction with the accompanying drawings.

[0009] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0010] Actual problems: Since the development of the 30TWG230 continuous rolling process, its rolling efficiency has been steadily improved, and the trimming quality has been significantly improved, but there is still the problem of cracking and breaking of weld punching during rolling. If the welding machine punching die is replaced for two months, the punching quality of 30TWG230 cannot be guaranteed, resulting in huge waste of die spare parts and serious impact on production efficiency. In order to further improve rolling stability and reduce the probability of weld punching and breaking. A manual weld confirmation system was added next to the weld detector at the entrance of the continuous rolling mill. The system can avoid weld punching and solve the weld tracking problem by manual confirmation. It can not only avoid the problem of broken strips caused by weld punching, but also accurately determine the weld position and reduce the waste caused by weld entanglement.

[0011] After nearly a year of exploration, continuous optimization of the control system, and on-site research and verification, we finally invented "a method for rolling high-grade silicon steel welds without punching."

[0012] The details are as follows:

[0013] A method for rolling high-grade silicon steel welds without punching, comprising the following steps:

[0014] Step 1: "One selection": The welding machine is at the pickling entrance. The production operator is required to select the "NO PUNTCH" mode, i.e. "no punching mode", on the welding machine operation box after completing the operation of welding the head and tail of high-grade silicon steel strips with the laser welding machine.

[0015] Step 2: "Two inspections": First, after welding is completed, the production operator at the main pickling operation table needs to check whether the weld has defects to prevent the defective weld from entering the rolling mill and causing the steel strip to be torn due to loose welding; second, at the tension straightening machine, the production operator needs to pay attention to the method of reducing the fast opening and breaking of the acid continuous rolling tension straightening machine: compensate and correct the opening point of the tension straightening machine by opening the distance compensation value, and compensate and correct the closing point of the tension straightening machine by closing the distance compensation value, so that the strip weld is exactly between the opening point and the closing point of the tension straightening machine, avoiding the strip from breaking at the weld position; the production operator at the disc shear operation table needs to observe whether there are acid spots caused by excessive acid on the surface of the strip after pickling in the pickling tank, and at the same time, it is necessary to observe whether there are cracks on the edge of the strip after the disc shear edge, and deal with it in time to prevent it from entering the rolling mill and causing strip breakage.

[0016] Step 3: "Three Presses": A set of manual weld confirmation device is set at the entrance of the rolling mill. When rolling high-grade silicon steel and there is no need to punch the weld, the production operator can select the mode switch to "on" and press the system "on" button at the same time. The signal is transmitted to the existing programmable logic controller through a hard-wired connection. There is a mode switching module in the programmable logic controller. After selecting the "on" mode, it runs according to the logic of the system "on"; when the weld comes to the 5# weld detection device, the production operator quickly presses the weld confirmation button. The signal also enters the programmable logic controller through a hard-wired connection and triggers the non-punching logic program. When the programmable logic controller receives the weld pulse trigger signal, it outputs a weld reception completion signal, which is transmitted to the weld confirmation device through a hard wire. At the same time, the alarm light shows red. After the programmable logic controller completes the weld confirmation action, the subsequent production operator's operation process for steel rolling is the same as the punching mode. The manual weld confirmation system includes The following functions: 1. Switching mode: When rolling high-grade silicon steel, press the selection device input button on the weld manual confirmation system, and switch back to the initial state when rolling medium and low-grade silicon steel; 2. Weld confirmation button: When the production operator observes that the weld is below the 5# weld detection device at the entrance of the rolling mill, immediately press the confirmation button. Since the weld hole detection is a pulse signal, the production operator delays 0.1″ after pressing the confirmation button, and the button automatically resets; 3. The on-site operation box is designed with a weld confirmation completion warning light. When the alarm light changes from green to red, it means that the weld confirmation action is completed, and the 10″ alarm light returns to the initial state.

[0017] Step 4: "Four Adjustments": After the weld confirmation action is completed, the production operator on the main console of the rolling mill can see the alarm information of the weld entering the rolling mill from the HMI alarm screen. At this time, the weld tracking starts. Before entering the frame, the production worker needs to make fine adjustments to the rolling parameters. Due to the use of wire welding process, the weld thickness is generally 20% higher than the parent material. When entering the rolling mill, the rolling load fluctuates greatly and is unstable. Therefore, when the weld enters the first to fifth frames in turn, lightly click the roll gap opening button to reduce the rolling load fluctuation when the weld passes through the frame. At the same time, select the weld quick opening mode, and quickly place the shifting rollers of the first and second frames on both sides of the strip to reduce the stress effect at the steel strip welding point.

[0018] When rolling high-grade silicon steel, the plate shape control mode only uses emulsion point cooling control and leveling control mode to avoid using bending and shifting roll control.

[0019] After implementing "a method for punching holes in rolled high-grade silicon steel welds", the company can generate annual cumulative benefits of approximately RMB 3.02 million.

[0020] The production efficiency of high-grade silicon steel has increased by 6.4%. The silicon steel acid continuous rolling currently rolls an average of 2,000 tons of high-grade silicon steel per month. According to production feedback, the average monthly reduction in belt breakage is 10 times, each saving 0.6 hours of production time, and 6 hours of monthly time saving, calculated at 60 tons / hour. Indirect benefits: 60 tons / hour × 6 hours / month × 12 = 4,320 tons / year, saving 500,000 yuan / year in spare parts loss costs for punching dies. Direct benefits: High-grade silicon steel is calculated at a profit of 1,500 yuan / ton for grade 30TWG230, and the yield rate is increased by 7%, 1,500 yuan / ton × 2,000 tons / month × 7% × 12 = 2.52 million yuan / year. Annual direct benefits: 2.52+50 = 3.02 million yuan; annual indirect benefits: 360 tons / month × 12 = 4,320 tons / year.

[0021] The patented equipment of the present invention has low investment cost, and the manual confirmation system for positioning the high-grade silicon steel punching-free weld can help the user unit achieve the goal of reducing costs and increasing efficiency, and reduce the equipment failure rate. In particular, it provides an effective and stable solution for the frequent failures of welding point detection of continuous line units.

[0022] The above description is only a specific embodiment of the present invention, but the structural features of the protection scope of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are all covered by the patent scope of the present invention.

Claims

1. A method for rolling high-grade silicon steel welds without punching, characterized in that: The steps include: Step 1: "One selection": At the pickling entrance, the welding machine requires the production operator to select "NO PUNTCH" mode, i.e. "no punching mode", on the welding machine operation box after the laser welding of the high-grade silicon steel strip head and tail is completed; Step 2: "Second inspection": First, after welding, the production operator at the main pickling operation table needs to check whether the weld has defects to prevent the defective weld from entering the rolling mill and causing the steel strip to be torn due to loose welding; Secondly, at the tension straightening machine, production operators need to pay attention to adopting methods to reduce the quick opening and breaking of the acid continuous rolling tension straightening machine: compensate and correct the opening point of the tension straightening machine by opening the distance compensation value, and compensate and correct the closing point of the tension straightening machine by closing the distance compensation value, so that the strip weld is exactly between the opening point and the closing point of the tension straightening machine, avoiding the strip breaking at the weld position; production operators at the disc shear operating table need to observe whether there are acid spots caused by excessive acid on the surface of the strip after pickling in the pickling tank, and at the same time, observe whether there are crack surface defects on the edge of the strip after the disc shear edge, and deal with them in time to prevent it from entering the rolling mill and causing strip breaking; Step 3: "Three presses": a set of manual weld confirmation device is set at the entrance of the rolling mill.

1. Switching mode: When rolling high-grade silicon steel, press the selection device input button on the manual weld confirmation device, and switch back to the initial state when rolling medium and low-grade silicon steel; 2. Weld confirmation button: When the production operator observes that the weld is below the 5# weld detection device at the entrance of the rolling mill, press the confirmation button immediately. Since the weld hole detection is a pulse signal, the production operator will delay 0.1" after pressing the confirmation button, and the button will automatically reset; 3. The manual weld confirmation device is designed with a weld confirmation completion warning light. When the warning light changes from green to red, it means that the weld confirmation action is completed, and the 10" warning light returns to the initial state; Step 4: "Four Adjustments": After the weld confirmation action is completed, the production operator on the main console of the rolling mill can see the alarm information of the weld entering the rolling mill from the HMI alarm screen. At this time, the weld tracking starts. Before entering the frame, the production worker needs to make a fine adjustment of the rolling parameters. Due to the use of the wire welding process, the weld thickness is 10%-20% higher than the parent material. When entering the rolling mill, the rolling load fluctuates greatly and is unstable. Therefore, when the weld enters the first to fifth frames in turn, lightly click the roll gap opening button to reduce the rolling load fluctuation when the weld passes through the frame. At the same time, select the weld quick opening mode, and quickly place the shifting rollers of the first and second frames on both sides of the strip to reduce the stress effect at the steel strip welding point.

2. The method for rolling high-grade silicon steel weld without punching according to claim 1, characterized in that: When rolling high-grade silicon steel, the plate shape control mode only uses emulsion point cooling control and leveling control mode to avoid using bending and shifting roll control.

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