What are The Common cCauses and Troubleshooting Methods for The Vacuum Degree of the Vacuum Sintering Furnace not Meeting the Set Standards?
Release time:
2025-11-19
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Abstract
The vacuum degree of the vacuum sintering furnace does not meet the set standards, which is a common but serious problem that can directly lead to product oxidation, decarburization, or performance degradation. The causes and troubleshooting of its faults should follow the principle of simplicity to complexity and from the outside to the inside.
The common causes of faults and troubleshooting methods are as follows:
Leakage of sealing system: This is the most common cause.
Reason: The sealing rings (usually O-rings or metal pads) at the furnace door, observation window, electrode introduction device, thermocouple sleeve, etc. are aging, damaged, improperly installed, or have foreign objects in the sealing groove, causing external air to be sucked into the vacuum chamber.
Troubleshooting:
Preliminary inspection: Start the vacuum pump in an unheated state and move your hand or listening stick near the possible leakage point to feel or listen for the "hissing" sound of air flow being sucked in.
Pressure holding test: Close all valves to isolate the furnace body from the vacuum pump, and observe the vacuum gauge reading. If the pressure rises rapidly, it indicates the presence of a significant leak point.
Helium mass spectrometry leak detection: This is the most accurate method. Spray helium gas onto the suspected area, and the connected helium mass spectrometer leak detector can accurately locate small leak points.
Decreased efficiency of vacuum pump system:
Reason:
Pump oil problem: The oil level of mechanical pumps or Roots pumps is too low, the oil quality is emulsified, contaminated or oxidized, which seriously affects the pumping efficiency.
Pump body failure: worn parts inside the pump, stuck rotor blades, increased rotor clearance or poor cooling effect of Roots pump.
Filter blockage: The dust filter at the inlet of the pump or the oil and gas filter at the outlet are blocked by volatile dust, adhesives, etc. during the process, forming throttling.
Troubleshooting:
Check the oil level, color, and viscosity of each pump, and replace if necessary.
Touch the pump body and check if the operating temperature is abnormally high.
Check the pressure difference before and after the filter, or test the temporary bypass filter. If the vacuum level improves, clean or replace the filter element.
Process operation and material impact:
Reason:
Material release: The powder compacts loaded in the furnace contain a large amount of lubricants or binders, which evaporate significantly during heating, and their release rate exceeds the pumping speed of the vacuum pump.
Pollution inside the furnace: Volatile substances accumulated on the furnace wall, insulation screen, and heating element will be released again during the next heating.
Troubleshooting:
Check the process curve to confirm whether sufficient insulation platforms and slow heating rates are set up during the low-temperature stage when the adhesive evaporates violently, so that the pump system can effectively extract gas.
Observe whether the malfunction occurred in a specific product or process. Regularly conduct high-temperature baking and cleaning of the furnace to remove residual pollutants.
Systematically following the above troubleshooting steps can usually locate and solve the vast majority of vacuum degree non-compliance problems.
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2022-07-28
2025-11-24
Zhuzhou Chi Carbon Automation Equipment Co., Ltd
1
Email:13077017815@163.com
chitanauto@163.com
Adresse:
Building 4, Phase 2.5, Independent Entrepreneurship Park, Tianyi Science and Technology City, Tianyuan District, Zhuzhou City, Hunan Province, China
Mr. Gong +86 13975355803
