A method of continuously quenching a steel sheet

Abstract

The present application relates to the technical field of metallurgical quenching, and discloses a steel plate continuous quenching method, wherein suitable quenching machine water cooling parameters are selected in advance, and the furnace doors of the heat treatment furnace are adjusted to the normally open state; the high-pressure pump and the low-pressure pump of the quenching machine continuously operate at high frequency, the cooling water reaches high pressure 0.8 Mpa and low pressure 0.4 Mpa; the quenching machine roller is manually and forcibly opened to water to ensure that the water is in the normally open state, and a tracking signal is manually triggered; after the water quantity, the roller speed and the frame height all meet the conditions, the steel plate is discharged at the point, and the forced steel discharge or the automatic steel discharge is clicked; the upper plate roller before the heat treatment furnace is full of steel plates with a spacing of 2 m, so that the heat treatment furnace continuously loads the plates; after the automatic loading of the steel plates, the upper plate roller is manually operated to pull the plates, the steel plates are pulled to the front and rear of the heat treatment furnace, and the continuous loading of the steel plates is ensured after the steel plate signal is completed; the present application adopts the continuous quenching production mode, realizes the thin specification continuous quenching production, and improves the quenching production efficiency of the thin specification steel plate by 0.2 times.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical quenching, in particular to a steel plate continuous quenching method. BACKGROUND

[0002] At present, no enterprise in China adopts this method for continuous quenching production of thin-gauge steel plates. The main advantages of continuous quenching production are to break the limitations of the current thin-gauge steel plate loading into the heat treatment furnace, to improve the production efficiency by using the continuous quenching method, and to reduce the waiting time of the steel plate in the heat treatment furnace during the water quantity adjustment process of the quenching machine. Moreover, the continuous quenching has certain requirements for the tracking accuracy of the heat treatment furnace and the quenching machine. At present, no enterprise in China adopts this method for continuous quenching production of thin-gauge steel plates. Therefore, there is an urgent need for a steel plate continuous quenching method to solve the problem that the existing technology cannot be used for continuous quenching production of thin-gauge steel plates. SUMMARY

[0003] In view of the problems in the prior art, the purpose of the present application is to provide a steel plate continuous quenching method.

[0004] The technical scheme adopted by the present application to solve the technical problems is: a steel plate continuous quenching method, comprising the following steps:

[0005] 1) Select appropriate quenching machine water cooling parameters in advance, and adjust the front and rear furnace doors of the heat treatment furnace to the normal open state;

[0006] 2) The high-pressure pump and the low-pressure pump of the quenching machine are continuously operated at high frequency, the cooling water reaches high pressure 0.8Mpa and low pressure 0.4Mpa, and the pressure will be continuously maintained unchanged;

[0007] 3) The quenching machine roller is set to manual and forced water opening, ensuring that the water is in the normal open state, and a tracking signal is automatically generated every 80 seconds. If the steel plate is about to be discharged from the furnace and the furnace time is less than 80 seconds, manually trigger the tracking signal;

[0008] 4) After the water quantity, roller speed and frame height all meet the conditions, click forced steel discharge or automatic steel discharge after the steel plate discharge time point;

[0009] 5) The upper plate roller in front of the heat treatment furnace is full of steel plates with a spacing of 2m, ensuring continuous plate loading of the heat treatment furnace;

[0010] 6) After the steel plate is automatically loaded, the upper plate roller is manually pulled to pull the steel plate to the front and rear of the heat treatment furnace, and the steel plate signal is continuously loaded after the steel plate signal is completed.

[0011] Specifically, the high and low pressure water quantity of the high pressure pump and the low pressure pump in the step 2) fluctuates less than 50m 3 / h.

[0012] Specific is, the heat treatment furnace in step 5) continuous plate loading needs to adjust the heat treatment furnace front plate arrangement program, set a safety distance of 2m between signals, place the steel plate on the upper plate roller, then build a signal according to the steel plate specification, pull the plate to the furnace front roller, then place another steel plate on the upper plate roller, build another signal according to the steel plate specification, automatically pull the plate to the tail of the previous steel plate 2m, and so on, the heat treatment furnace front roller is full of steel plates, and the steel plates can be continuously loaded into the furnace.

[0013] Specific is, the steel plate on the upper plate roller in front of the heat treatment furnace is tracked for accuracy and deviation, the steel plate is first punched and centered on the upper plate roller in front of the heat treatment furnace, and is loaded into the furnace and discharged from the quenching machine according to the normal production process, after quenching, the steel plate reaches the discharge roller, and the steel plate deviation is measured, after multiple tests, the actual position of the steel plate deviates from the signal position within 100mm, and the steel plate deviation distance from the center line of the roller is within 20mm.

[0014] Specific is, after the steel plate is automatically loaded in step 6), the water level in the drainage ditch behind the quenching machine is continuously high, the water depth is 1.7m, the water level has no growth trend, and the water treatment system capacity meets the continuous quenching requirement.

[0015] The present application has the following beneficial effects:

[0016] The continuous quenching method designed in the present application adopts a continuous quenching production mode, forms a thin-gauge steel plate quenching water formula, realizes thin-gauge continuous quenching production, and improves the thin-gauge steel plate quenching production efficiency by 0.2 times, overcomes the difficulty of low thin-gauge steel plate production efficiency, and greatly promotes the improvement of the heat treatment production line production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a flow chart of the continuous quenching process. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be further clearly, completely and specifically described in combination with the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0019] As Figure 1As shown, a continuous quenching method for steel plates is carried out under the premise of ensuring equipment safety and theoretical operability, and continuous quenching production tests are carried out to confirm the plate arrangement capacity of the roller table in front of the heat treatment furnace, the tracking accuracy of the steel plate, the steel plate deviation, the continuous water high and low pressure pump conditions of the quenching machine, and the water treatment capacity. Continuous quenching production tests are carried out under the premise of meeting the requirements. By debugging the quenching water formula, the plate shape can meet the needs of national standards and industry standards.

[0020] 1. Plate arrangement capacity of roller table in front of heat treatment furnace

[0021] Adjust the plate arrangement program in front of the heat treatment furnace, setting a safety distance of 2m between signals. Place the steel plate on the upper plate roller (in the plate stacking machine area), then generate a signal based on the plate specifications to pull the plate onto the furnace roller (in the furnace area). Then, place another steel plate on the upper plate roller, generate another signal based on the plate specifications, and automatically pull the plate to 2m from the end of the previous steel plate. Repeat this process, ensuring that the heat treatment furnace roller is fully loaded with steel plates and that the steel plates can be continuously loaded into the furnace.

[0022] 2. Confirm the steel plate tracking accuracy and deviation

[0023] The steel plates are first aligned and centered on the furnace rollers before being loaded into the furnace and discharged from the quenching machine according to normal production processes. After quenching, the steel plates arrive on the discharge rollers for plate deviation measurement. After multiple tests, the deviation between the actual plate position and the signal position is within 100 mm, and the plate deviation is within 20 mm from the roller centerline.

[0024] The heat treatment furnace's front and rear rollers are 4.3m wide, with an effective width of 4.5m inside the furnace. The quenching mill's rollers are 4.5m wide, and the discharge rollers are 4.3m wide. The steel plate's deviation is 20mm, fully meeting safety requirements.

[0025] 3. Continuous water high and low pressure pumps of quenching machine

[0026] The high-pressure pump and low-pressure pump of the quenching machine are operated continuously at high frequency, and the cooling water reaches a high pressure of 0.8Mpa and a low pressure of 0.4Mpa. The pressure will remain unchanged, and the fluctuation of high and low pressure water volume is less than 50m 3 The roller table of the quenching machine is set to manual and forced to open the water to ensure that the water is always on. The operation of the high and low pressure pumps is continuously monitored. According to the production situation, the high and low pressure pumps can ensure continuous high-frequency operation without any abnormalities.

[0027] 4. Water treatment capacity

[0028] During continuous quenching, the water level in the drainage ditch behind the quenching machine remained high, with a depth of about 1.7m, but there was no increasing trend. The water treatment system capacity met the requirements of continuous quenching.

[0029] 5. Steel plate shape debugging

[0030] By controlling the quenching machine gap, the water ratio in the high-pressure nozzle cavity, and adjusting parameters such as quenching roller speed, water volume, and frame height, we ensure uniform cooling across the width of the steel plate and maintain consistent plate shape. Steel plates thicker than 10mm can achieve a straightness of 6mm / 2m after quenching, meeting the needs of wear-resistant and quenched and tempered steel plates.

[0031] 6. Continuous quenching process operation flow

[0032] 1) Select appropriate quenching machine water cooling parameters in advance, and adjust the front and rear doors of the heat treatment furnace to the normally open state.

[0033] 2) The high-pressure pump and the low-pressure pump continue to run at a high frequency, and the cooling water reaches a high pressure of 0.8Mpa and a low pressure of 0.4Mpa, and the pressure will remain unchanged.

[0034] 3) Set the quenching machine roller to manual mode and force water to be turned on to ensure that the water is always on. A tracking signal is automatically generated every 80 seconds. If the steel plate to be taken out of the furnace has been in the furnace for less than 80 seconds, manually trigger the generation of the tracking signal.

[0035] 4) When the water volume, roller speed and frame height meet the requirements and the steel plate is ready for discharge, click on forced discharge or automatic discharge.

[0036] 5) The plate loading roller in front of the furnace is filled with steel plates with a spacing of 2m to ensure continuous loading of plates into the heat treatment furnace.

[0037] 6) After the steel plate is automatically loaded, the upper plate roller is manually pulled to pull the plate. The steel plate is pulled to the front and back of the heat treatment furnace. After the steel plate signal is made, the steel is continuously loaded.

[0038] In order to reduce the waiting time of steel plates in the heat treatment furnace during the water volume adjustment of the quenching machine (Fuzzy-PID water volume regulation system), a water volume formula for quenching thin-gauge steel plates was formed, which realized continuous quenching production of thin-gauge steel plates and increased the quenching production efficiency of thin-gauge steel plates by 0.2 times.

[0039] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

[0040] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A method for continuous quenching of a steel plate, characterized in that: The following steps are involved: 1) Select appropriate quenching machine water cooling parameters in advance, and adjust the front and rear doors of the heat treatment furnace to the normally open state; 2) The high-pressure pump and low-pressure pump of the quenching machine continue to run at high frequency, and the cooling water reaches a high pressure of 0.8MPa and a low pressure of 0.4MPa, and the pressure will remain unchanged; 3) Set the quenching machine roller to manual mode and force water to be turned on, ensuring that the water is always on. Automatically generate a tracking signal every 80 seconds. If the steel plate to be taken out of the furnace has been in the furnace for less than 80 seconds, manually trigger the generation of a tracking signal. 4) When the water volume, roller speed and frame height meet the requirements and the steel plate is ready for tapping, click on forced tapping or automatic tapping; 5) The loading roller in front of the heat treatment furnace is filled with steel plates with a spacing of 2m to ensure continuous loading of the heat treatment furnace; 6) After the steel plate is automatically loaded, the loading roller is manually turned to pull the plate. The steel plate is pulled to the front and back of the heat treatment furnace. After the steel plate signal is made, the steel is continuously loaded.

2. The method for continuous quenching of a steel plate according to claim 1, wherein: The fluctuation of the high and low pressure water volume of the high pressure pump and the low pressure pump in step 2) is less than 50m 3 / h.

3. The method for continuous quenching of a steel plate according to claim 1, wherein: The continuous loading of the heat treatment furnace in step 5) requires adjustment of the heat treatment furnace front plate arrangement program, setting a safety distance of 2m between signals, placing the steel plate on the upper plate roller, then generating a signal according to the steel plate specifications, pulling the plate to the furnace front roller, then placing another steel plate on the upper plate roller, generating another signal according to the steel plate specifications, and automatically pulling the plate to 2m from the tail of the previous steel plate, and so on. When the heat treatment furnace front roller is full of steel plates, the steel plates can be continuously loaded into the furnace.

4. The method for continuous quenching of a steel plate according to claim 1, wherein: The steel plate in step 5) is tracked and aligned on the upper plate roller in front of the heat treatment furnace for tracking accuracy and deviation confirmation. The steel plate is first aligned and centered on the upper plate roller in front of the heat treatment furnace, loaded into the furnace and discharged from the quenching machine according to the normal production process. After quenching, the steel plate arrives at the unloading roller and the steel plate deviation is measured. After multiple tests, the deviation between the actual position of the steel plate and the signal position is within 100 mm, and the steel plate deviation is within 20 mm from the center line of the roller.

5. The method for continuous quenching of a steel plate according to claim 1, wherein: During the continuous quenching after the automatic loading of the steel plates in step 6), the water level in the drainage ditch behind the quenching machine remained high, with a water depth of 1.7 m, and there was no increasing trend in the water level. The water treatment system capacity met the continuous quenching requirements.

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