General Quenching Machine Safety Procedures
Before work, check whether equipment is operating normally. If cylinders are not functioning well or valves are leaking, find a repair technician promptly. Remove rust from quenching machines and apply oil, and cover the machine after use. Do not strike the quenching machine during use. When melting salt, do not approach the furnace or work near electrode wires.
Keep the floor clean and dry. Do not sprinkle water to prevent workpieces from contacting water causing rust or furnace explosions. Flammable objects must not be placed near the furnace or oil tanks to prevent fire. When two or more people work together, coordinate operations and maintain consistent movements. Be careful when checking workpiece cross-sections, and be aware of personnel around you when hammering. Do not place conductive items such as hooks or pliers near electrical switches. Workpieces near the furnace must be cooled before handling to avoid burns.
High-Frequency Heat Treatment Quenching Safety Procedures
High-frequency equipment must be operated by at least two people, with a designated operator in charge. Check shielding and protective barriers are in good condition. During operation, unauthorized personnel should not enter the work area. Check that all equipment ground wires are reliable and the quenching machine is functioning properly, and that mechanical hydraulic transmission is working normally.
Start the water pump and check cooling water outlet is normal, with cooling water pressure between 0.12 and 0.2 MPa. Do not touch equipment cooling water with hands. After the cooling system is confirmed normal, energize the equipment for preheating. First-stage filament preheating takes 30 to 45 minutes, second-stage filament preheating takes 15 minutes. Engage the plate high voltage and adjust the phase shifter to high voltage. After adding high frequency, hands must not touch the busbar or inductor.
Install the inductor, connect cooling water, and place the workpiece into the inductor for heating. It is strictly prohibited to energize without a load. When changing workpieces, the high frequency must be stopped. If high frequency cannot be stopped, immediately disconnect the high voltage connection emergency switch. During operation, ensure anode current and grid current do not exceed specified values. All machine doors must be closed during operation. After high voltage is engaged, do not casually move behind the machine or open machine doors.
After work, first disconnect the anode voltage, then disconnect the filament power supply. After equipment power is disconnected, continue supplying water for 15 to 20 minutes to allow the electron tubes to cool fully. Equipment should be kept clean and dry, free from dust and moisture. The room should be equipped with effective ventilation to exhaust smoke and waste gas generated during quenching.
Flame Quenching Safety Procedures
Oxygen cylinders should be placed upright and secured with clamps. Do not place oxygen cylinders near fire or heat sources, and prevent collision and exposure to sunlight. Oxygen cylinders should not be placed together with acetylene generators and should be separated by at least 5 to 10 meters. No grease is allowed on oxygen cylinders, and hands with oily gloves should not be used to open oxygen cylinders.
Acetylene generators should be at least 10 meters from the flame quenching work location. Water temperature of acetylene generators must not exceed 60 degrees Celsius, and surrounding air temperature must not exceed 40 degrees Celsius. If equipment backfires, immediately close the oxygen and acetylene valves to prevent explosion. Before each work session and after backfire events, check the water level. The spray nozzle should be made of copper and must not be placed on the ground. When the nozzle temperature is too high, suspend operation or close the acetylene valve but do not close the oxygen valve, then place the nozzle in cold water for cooling.
