The debugging of hot press sintering furnace is a systematic project that requires strict adherence to standardized procedures to ensure equipment performance and process stability. The following is an explanation of debugging points based on industry practice:
1、 Installation and mechanical system inspection
-Equipment positioning and fixation
According to the layout plan, equipment positioning should be completed. When fixing the mechanical pump, damping rubber plates should be used for shock absorption to avoid vibration affecting accuracy during operation. Check the consistency between all attachments and the shipping list to ensure the sealing of vacuum pipelines and valve connections.
-Hydraulic and transmission system debugging
Check the flexibility of the hydraulic cylinder lifting and lowering, and verify the smoothness of the pressurization process by manually adjusting the pressure sensor and displacement display (with an accuracy of 0.02mm). Special attention should be paid to the response speed and pressure stability of the proportional valve to avoid sample deformation caused by pressure shock.
2、 Joint debugging of electrical and vacuum systems
-Vacuum system testing
After starting the mechanical pump, turn on the Roots pump and diffusion pump in sequence, and monitor the changes in vacuum degree. A high vacuum environment of 6 × 10 ⁻ ² Pa is required before entering the heating stage. It is recommended to vacuum and let it stand for 24 hours to test the leakage rate.
-Temperature control system calibration
Adopt PID function instrument for temperature control and test the over temperature alarm function. Thermocouples need to automatically enter and exit positioning to avoid short circuits caused by contact with heating elements.
3、 Heating and pressurization process validation
-Heating program test
Heat up to 1600 ℃ at a rate of ≤ 5 ℃/min and observe temperature uniformity for more than 4 hours. For new furnace bodies, oxidation treatment at 400 ℃ is required to extend the lifespan of refractory materials.
-Bidirectional pressurization operation
After manual preloading, switch to automatic pressurization mode and slowly increase the pressure at a gradient of 0.1MPa per time, monitoring displacement changes through a grating ruler. The distance between the graphite electrode and the insulation screen needs to be precisely adjusted to prevent partial discharge.
4、 Safety interlock and emergency mechanism
-Multiple protection testing
Verify the automatic interlocking response during water, power, and overheating situations. Forcefully cut off the cooling water to simulate a fault and confirm that the heating system is immediately terminated.
-Pressure relief and cooling specifications
After the pressure maintenance is completed, the furnace temperature must be lowered to below 60 ℃ before emptying, and the surface temperature of the diffusion pump must be ≤ 30 ℃ before it can be turned off.