JPWO2023026773A5 - - Google Patents

Claims (15)

A metal plate quenching apparatus that cools a metal plate while conveying it,
a cooling device for cooling the metal plate to be conveyed;
a constraining roll that conveys the metal plate cooled by the cooling device while constraining it in the thickness direction;
a roll moving device for moving the restraint roll along the conveying direction of the metal plate;
a movement control device that controls the operation of the roll movement device to adjust the position of the restraint roll;
A metal plate quenching device. 2. The apparatus for hardening a metal plate according to claim 1, wherein the cooling device has a plurality of nozzles for cooling the metal plate by injecting a cooling fluid. 2. The apparatus for quenching a metal plate according to claim 1 , wherein the cooling device has a cooling tank in which the metal plate is immersed and cooled. 2. The movement control device according to claim 1 , wherein the movement control device controls the operation of the roll movement device and positions the restraint roll so that the restraint roll restrains the metal plate at a position where the metal plate reaches the target temperature. metal plate quenching equipment. The target temperature is (TMs + 150) (°C), where TMs (°C) is the temperature at the Ms point where the martensitic transformation of the metal plate starts, and TMf (°C) is the temperature at the Mf point where the martensitic transformation ends. 5. The apparatus for quenching a metal plate according to claim 4, wherein the temperature is set within a temperature range of ~(TMf-150)(°C). The movement control device controls the distance from the cooling start position of the cooling device to the constraining roll, the conveying speed of the metal plate, the cooling start temperature of the metal plate when cooling is started by the cooling device, and the target temperature. 6. The apparatus for hardening a metal plate according to claim 4 or 5, wherein the position of the restraint roll is set based on the cooling rate of the metal plate, and the position of the restraint roll is moved so as to reach the set distance. The movement control device sets the conveying speed of the metal plate to v (mm/s), the cooling start temperature to T1 (°C), the target temperature to T2 (°C), and the cooling speed of the metal plate by the cooling device to CV. 7. The apparatus for quenching a metal plate according to claim 6, wherein the distance d (mm) from the cooling start position to the restraint roll is obtained by formula (1), where (° C./s).
d=(T1-T2)×v/CV (1) 8. The metal plate according to claim 7, wherein the cooling rate CV is set to CV=α/t by the thickness t of the metal plate and the coefficient α indicating the cooling condition of the metal plate in the movement control device. quenching equipment. A metal plate quenching method for cooling while conveying the metal plate,
When the cooled metal plate is constrained in the thickness direction by the constraining rolls, the constraining rolls are moved along the conveying direction of the metal plate so as to constrain the metal plate at a position where the metal plate is at the target temperature. A method of quenching a moving metal plate. The target temperature is (TMs + 150) (°C), where TMs (°C) is the temperature at the Ms point where the martensitic transformation of the metal plate starts, and TMf (°C) is the temperature at the Mf point where the martensitic transformation ends. 10. The method of quenching a metal plate according to claim 9, wherein the temperature is set within a range of ~(TMf-150)(°C). The movement of the restraint roll is performed from the cooling start position to the restraint roll based on the conveying speed of the metal plate, the cooling start temperature of the metal plate at the start of cooling, the target temperature, and the cooling speed of the metal plate. Set the distance to the roll,
10. The method of quenching a metal plate according to claim 9 , wherein the quenching is performed by moving the constraining rolls so as to achieve a set distance. The distance from the cooling start position to the restraint roll is v (mm/s) for the conveying speed of the metal plate, T1 (° C.) for the cooling start temperature, T2 (° C.) for the target temperature, and cooling of the metal plate. 12. The method of quenching a metal plate according to claim 11, wherein the distance d (mm) from the cooling start position to the restraint roll is obtained by formula (1), where CV (° C./s) is the speed.
d=(T1-T2)×v/CV (1) 13. The method of hardening a metal plate according to claim 12, wherein the cooling rate CV is set as CV=[alpha]/t by a coefficient [alpha] indicating a cooling condition of the metal plate and a plate thickness t of the metal plate. A method for producing a metal plate using the method for hardening a metal plate according to any one of claims 9 to 13. A method for producing a metal plate , wherein the metal plate obtained by the method according to claim 14 is subjected to any one of hot-dip galvanizing treatment, electro-galvanizing treatment, or alloying hot-dip galvanizing treatment.