Vacuum brazing furnace operation procedures

Vacuum brazing furnace operation procedures

First, before the vacuum brazing furnace blow-in, ensure that water, electricity, gas in the assignments. In 380 v voltage, can not have the deviation of 10%. Pressure in 0.6 Mpa, the water pressure to the lowest (0.5 Mpa). Reach the above requirements to electricity, after operation.
Second, before feeding, check the equipment heating chamber, the heating chamber is necessary to clean, can not have sundry, dust, oil, water, etc. In view to put goods, dry cleaning, same before feeding the without watermarks, oil and other washing clean.
Third, after loading, the knob to the "door close" position. Then, a "mechanical pump" and "thick smoke valve". Of vacuum unit and the furnace smoke gas, opened the vacuum furnace with the power supply (general vacuum gauge power to launch with total power supply).
Fourth, when the vacuum degree higher than 1000 pa, vacuum gauge monitoring "J2" light. This time, can open "roots pump. Conditions such as, "roots pump" will not open, click on the button no response.
Five, when the vacuum degree is higher than 7 pa, vacuum gauge monitoring "J1" light. Level before this time, open the "valve" and "scattered pump". For preheating scattered "pump".
Six, to be scattered "pump" preheating time arrive 90 minutes time (on the counter investigation touch screen), closed "thick smoke valve", opened the "high valve", the high vacuum chamber of a stove or furnace.
Seven, when after the vacuity of the vacuum chamber of a stove or furnace to operations (vacuum gauge monitoring "J3" light up, pay attention to the initial monitoring set is higher, can set may be arrived at the required vacuum, heating) to open, open the heating and temperature control table with the initiative launched operation (heating curve should be ready in advance).
Eight, heating, heat preservation whole process has been completed, "process completed" alarm, together, closed heating the initiative.
Nine, if choose natural cooling, let vacuum furnace equipment remains the same, for natural cooling equipment to the melt temperature, closed "high valve", "dispersed pump" and "roots pump", leaving only "mechanical pump" and "the former valve" to vacuum pump "dispersion" and cooling. Together to beat knob to the "door open" position. In a closed vacuum gauge, opened the "manual vent valve", were deflated, stay in furnace pressure and atmospheric pressure balance, oven door open, can take is expected to tighten together "manual vent valve". To be scattered "pump" temperature cooled to room temperature (about one hour), can be closed "mechanical pump" and "the former valve". Closed water, electricity, gas. Finished the whole process.
Ten, such as selection of strong cold, in step 8, closed "gauge", "high valve", "thick smoke valve", "pump" scattered, leaving only "mechanical pump" and "the former valve" to spread to vacuum pump and cooling. "Charging valve" in turn, to the furnace into nitrogen maybe after argon to basic balance and atmospheric (with a pressure gauge control fan start testing point and inflatable limit testing point), open air cooler, until cool to melt temperature (strong cold air is in the process of active control). Enclosed the "charging valve. After cooling to the melt temperature, the knob to the "door open" position. And then unscrew the manual vent valve inflatable to balance and atmospheric, oven door opened, and then screw down the "manual vent valve". Then in the discharge. Closed water, electricity, gas. Finished the whole process.