Heat treatment for safety operation procedures

1. Operators shall pay attention to fire prevention, explosion-proof, poison proof, scald proof and electric shock proof, understand relevant rescue knowledge and use fire-fighting equipment.

2. Before work, especially when quenching out of the furnace, it is necessary to wear protective masks, work clothes, gloves, protective shoes and other necessary protective articles. It is strictly prohibited to wear sandals to work.

3. Operators must master the heat treatment process specification, be familiar with the principle, structure and performance of heat treatment equipment and its distribution system, and master the use and maintenance methods of temperature measuring instruments.

4. Non heat treatment personnel shall not adjust or use heat treatment equipment, instruments and meters without permission.

5. Warning signs shall be set up in the heat treatment area, and non working personnel in the dangerous area (such as distribution cabinet, switch and quench parts storage area, etc.) shall not be allowed to get close to it to avoid accidents.

6. If a new furnace or furnace is repaired or is out of service for a long time for reuse, the furnace shall be dried according to the "process specification".

7. Preparation before operation

7.1. Check the power distribution cabinet. If there is anything harmful to electrical appliances in the power distribution cabinet, take it out after confirming the power failure. Check whether the distribution cabinet, temperature control instrument and display lamp are normal, and whether there is phase loss, phase imbalance, short circuit or bare wire.

7.2 check and measure whether the furnace shell is well grounded; check whether the electric heating lead out rod is loose, remove the scale of lead out rod and tighten the chuck. Check whether the electric heating elements in the furnace are burnt, and whether all connections are good; check whether the electric heating lead out rod and the electric heating elements in the furnace are connected with the furnace body.

7.3 check the wiring between thermocouple, compensation wire and instrument for short circuit, open circuit or poor contact.

7.4 check the furnace, clean the oxide scale under the furnace bottom plate, check whether the furnace lining, resistance wire brick laying furnace bottom plate and furnace bottom plate brick laying are in good condition, and repair in time in case of damage.

7.5 check whether the furnace cover is well sealed and insulated.

7.6 check whether the spreader and fixture are firm, whether there are cracks, damages, deformation and other phenomena, and whether they can meet the requirements of safety production and use.

7.7. Check whether there is any fault or unsafe hidden danger during driving.

7.8 check whether the workpiece is bruised, deformed, cracked, etc., and report the problems found in time to reduce the occurrence of heat treatment accidents.

8. When using the crane, strictly implement the safety operation regulations of the crane, and have a special person to command. It is not allowed to exceed the rated load of the crane. During the hoisting and hoisting operation, no one is allowed to stand under the hoisting workpiece and electric hoist.

9. It is forbidden to put wet or combustible substances into the furnace. If the oxide scale of the workpiece is very serious, it can be charged only after it is removed.

10. When installing and discharging, the power supply of heating elements must be cut off to prevent electric shock. When the workpiece is loaded and discharged from the furnace, it shall be confirmed that it is firmly clamped, lightly loaded and lightly unloaded. It is strictly prohibited to throw it at will to avoid collision with resistance wire or furnace wall or thermocouple; it is also prohibited to bump the workpiece. No matter the cold or hot workpieces, during the lifting process, the crane shall not stop in an emergency, and it is necessary to check whether there are obstacles around to prevent scalding and smashing accidents.

11. In order to avoid colliding with thermocouples during furnace charging, the thermocouples shall be hidden in the furnace wall first, and then the thermocouple lead out bar shall be fastened at the specified installation position after furnace charging; the same shall be true for furnace discharging.

12. The maximum operating temperature of the electric furnace shall not exceed the rated temperature to avoid burning the furnace.

13. The operator shall not leave the post without permission, and shall pay attention to whether the working condition of the temperature control instrument system is normal at any time; check and calibrate the instrument temperature at any time to prevent overheating of the workpiece due to temperature running. When the alarm light gives an alarm, it will generate corresponding audible and visual alarm. The cause of the accident can be roughly determined by the indicator light on the panel. If the operator cannot handle it, he shall immediately cut off the power supply and report in time.

14. Temperature measuring instruments and thermocouples shall be calibrated according to the specified period. The laser thermometer and the furnace temperature instrument shall be used to check each other each time they are discharged from the furnace. If the instrument is found to be inaccurate or faulty and is invalid after adjustment, it shall be stopped immediately and reported in time.

15. When the boiler is shut down, the button of the control cabinet shall be closed first and then the switch shall be opened.

16. After the first inspection of the workpiece in the heat treatment process, the quality inspection department shall be informed in time to test the hardness of the workpiece and record the test results. Change and implement the process in time for the non-conforming process requirements;

17. Mark and record the workpiece before and after discharging.

18. Keep the temperature operation curve, carefully fill in the heat treatment process procedure tracking record form, and file it in time.

19. Regularly maintain the heat treatment equipment, instruments and meters; do a good job in the sanitation of the heat treatment site.

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