The full hydrogen bell furnace equipment includes a furnace platform, an inner cover, a heating cover, and a cooling cover. The process of the full hydrogen bell furnace is as follows: at the beginning of annealing, the steel coils to be annealed are stacked on the bell furnace platform, the inner cover is hoisted, and the cold state sealing test is carried out on the furnace platform, the inner cover system and the hydrogen inlet valve, and the test is successful. Finally, put the heating mantle button on the stove and carry out nitrogen purging;HORIZONTAL MITRE BAND SAW MACHINE BS-85 When the nitrogen purge meets the conditions, replace the nitrogen in the inner cover with hydrogen; after the heating starts, select the heating curve according to different materials to control the temperature until the core temperature of the steel coil reaches the requirement; then remove the heating cover, and then hoist the cooling cover , using the surrounding ambient air to cool the inner cover through the fan on the cooling cover;HORIZONTAL MITRE BAND SAW MACHINE BS-115 When the thermocouple detects that the circulating atmosphere in the inner cover reaches the set temperature, the cooling cover fan stops running; after the temperature of the steel coil core reaches the set value, the cooling is completed, and the cooling cover is removed; then nitrogen is purged, The hydrogen in the inner cover is replaced, and the inner cover is removed; finally, the steel coil is lifted away, and a process is completed.Vacuum sintering of transparent ceramics After the production preparation is completed, the PLC will perform various media systems including water circulation, hydraulic system, protective gas and power supply, etc. After checking and judging that the safety system, measurement system and various hardware devices are working normally, issue a command to clamp the inner cover. After the inner cover is clamped, the control program will start each control program with a large time axis as a reference.Vacuum Heat Treatment of Fasteners