Distortion control of high-strength steel parts by high-pressure gas quench
18CrNiMo parts quenched in 10 bar nitrogen instead of oil: hardness HRC 48–51 across the charge, distortion down from 0.45 mm to 0.12 mm.
Wall thickness varies 1:6 across the part; the oil-quench route gave scattered distortion and 35% of total machining hours were spent on correction.
The JVGQ-126/7261 furnace delivers an equivalent severity of 4.5 bar/s with 10 bar nitrogen and reversible fans, combined with stepped austenitising and optimised loading orientation.
Five-point thermocouples interlock with inverter fans; recipes are recalled per material grade, and batch consistency is verified by spectrographic and hardness checks.
Results
Distortion 0.45 → 0.12 mm, machining hours down 62%, straightening removed, saving roughly ¥1.8 million a year.
Batch vacuum brazing of aero-engine titanium blades
0.5 mm thin-wall TC4 blades, 0.05–0.1 mm gap, 240 parts per charge, 6 months of serial delivery with 99.2% first-pass yield.
Export projectVacuum diffusion bonding of titanium sandwich panels for spacecraft
800 mm sandwich parts retain 92% base-metal strength after bonding; leak rate 1×10⁻⁹ Pa·m³/s; three sets delivered, including export to Europe.
Two-chamber vacuum furnace line for transmission gears
Two chambers alternate heating and cooling on a 42-minute cycle, 1.6 t per day, linked to loading robots for unmanned operation.
Export projectExport line for large cold-work tooling, vacuum oil quench
Cr12MoV blocks 180 mm thick, vacuum oil quenched with no scale or decarburisation, HRC 61–63; the furnace was exported with the tooling to Mexico.
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