Material response
Steel grade, starting condition and hardenability establish the heating and cooling window for tool, mold, high-speed, spring, stainless and alloy steels.
Double-chamber vacuum hardening system
Vacuum Oil Quenching Furnace
SYNHTE double-chamber systems combine clean vacuum heating with controlled oil quenching for tool steels, mold steels, high-speed steels and alloy-steel parts. Chamber size, hot zone, transfer, oil circulation and controls are matched to your load and production target.
Double chamberRapid load transferControlled oil condition
01 / Application fit
Furnace selection built around your parts
Material grade, geometry, prior condition, target hardness, dimensional tolerance and production load determine the heating, transfer and oil-quench configuration.
Section and geometry
Maximum section, bores, teeth, sharp transitions and fixture contact define load support and dimensional-control priorities.
Quench objective
Target hardness, metallographic checks, surface condition and dimensional tolerance shape the qualified process window.
Production load
Basket envelope, batch mass, load pattern, cycle target and annual volume determine transfer capacity and oil circulation.
Best suited to: parts requiring higher cooling severity than the selected gas-quench route while retaining clean vacuum heating and controlled transfer into oil. Process trials can validate hardness, surface condition and dimensional response on the production load.
02 / Process architecture
Separate clean heating from controlled oil quenching
The double-chamber arrangement keeps the heating hot zone and oil-quench zone functionally separate. The load is heated under vacuum, transferred through the interlocked route, submerged into conditioned oil and released only after the programmed sequence is complete.
- Load and evacuateBasket, fixture and part layout are checked against the approved load map before the heating chamber is evacuated.
- Preheat, heat and soakProgrammable segments manage the selected steel and section while vacuum, temperature and alarms are recorded.
- Interlocked rapid transferThe transfer arrangement and gate sequence are selected to control the interval between heating and immersion.
- Oil quench and circulationOil temperature, agitation or circulation, load position and dwell are managed as part of the qualified process window.
- Drain, cool and unloadThe release condition, residual-oil handling and next operation are agreed for the part family and plant workflow.
03 / Cooling-route boundary
Oil quenching for higher cooling severity
Oil quenching supports steels, sections and load densities that require a stronger cooling response. Gas cooling remains available for applications prioritizing clean unloading and adjustable convection.
Oil-quench route
For steel, section and load combinations requiring greater cooling severity.
- Double-chamber separation and controlled transfer
- Controlled oil temperature, circulation and filtration
- Integrated drainage, cleaning and oil-change planning
Gas-quench route
For suitable alloys and loads requiring clean, adjustable convective cooling.
- Gas type, pressure, flow distribution and heat-exchanger capacity
- Clean unloading with less downstream oil removal
- Part-level hardness and dimensional validation
04 / Furnace evidence
Hot-zone design and process control are specified together
Graphite or molybdenum hot zones combine with controlled oil temperature and circulation, interlocked operation, programmable recipes, alarms and process records in one production system.
Oil temperature and flow
Oil type, operating window, circulation or agitation, filtration and sampling are integrated into the quench system.
Vacuum and transfer
The pumping package, chamber cleanliness and load-transfer sequence are matched to the production cycle.
Traceability
Recipe versions, temperature and pressure records, alarms and operator actions support qualified-load traceability.
05 / VTO configurations
VTO configurations for production loads from 100 to 800 kg
Five VTO configurations cover work zones from 300 × 300 × 450 mm to 700 × 700 × 1200 mm. Custom load, utility, cycle and acceptance requirements are incorporated into the project proposal.
| Model | Effective work zone W × H × L | Batch load | Heating power | Max. temperature |
|---|---|---|---|---|
| VTO-335 | 300 × 300 × 450 mm | 100 kg | 50 kW | 1320°C |
| VTO-446 | 400 × 400 × 600 mm | 200 kg | 65 kW | 1320°C |
| VTO-557 | 500 × 500 × 700 mm | 300 kg | 100 kW | 1320°C |
| VTO-669 | 600 × 600 × 900 mm | 500 kg | 150 kW | 1320°C |
| VTO-7712 | 700 × 700 × 1200 mm | 800 kg | 200 kW | 1320°C |
Across the VTO range: ±1°C control accuracy, 4 × 10⁻¹ Pa ultimate vacuum, 0.5 Pa/h pressure-rise data and an optional 2 bar gas-cooling route. Final values and supplied scope are confirmed in the technical proposal.
Hot zoneGraphite or molybdenum options matched to process and cleanliness needs.
Oil systemAgitation or circulation, filtration and temperature-control arrangement.
Load transferAutomatic mechanism and interlocks sized around the approved load.
Vacuum packagePumping configuration matched to cleanliness and cycle objectives.
FixturesCustom baskets, trays and loading equipment for the part family.
ControlsPLC, touchscreen, recipes, records, alarms and agreed interfaces.
06 / FAT and SAT
FAT and SAT aligned with your acceptance criteria
FAT and SAT packages can cover the production load, instrumentation, test methods, pass criteria, documentation, training and retained process records.
Work-zone verificationAgreed temperature uniformity method, sensor layout, setpoints and report format.
Vacuum performanceUltimate pressure, pressure-rise method, timing and instrumentation scope.
Transfer sequenceInterlocks, transfer timing, load handling and recovery from abnormal conditions.
Oil systemTemperature window, circulation or agitation, filtration and alarm checks.
Process trialDefined material, fixture, load map, recipe and pre-agreed inspection evidence.
DocumentationDrawings, manuals, certificates in scope, records, training and handover list.
07 / Engineering enquiry
Configure the furnace around your production load
Our engineering team uses your material, part, batch, oil, throughput and site requirements to prepare the chamber, hot-zone, vacuum and control configuration.
RFQ 01Material
Steel grade, starting condition and prior heat treatment.
RFQ 02Part geometry
Maximum section, critical dimensions and distortion limit.
RFQ 03Acceptance result
Hardness, metallography, surface and inspection method.
RFQ 04Batch envelope
Basket size, total mass, load pattern and fixture concept.
RFQ 05Oil parameters
Oil type, temperature limits, quench severity and change control.
RFQ 06Production target
Cycle time, annual volume, shifts and loading method.
RFQ 07Site interfaces
Utilities, floor plan, exhaust, cooling water and local requirements.
RFQ 08Delivery evidence
FAT/SAT, records, documents, training and handover scope.
08 / Related equipment
Compare related vacuum heat-treatment systems
Which materials can be processed in a vacuum oil quenching furnace?
The VTO range supports tool steel, mold steel, high-speed steel, spring steel, stainless steel and other alloy steels, with the process configured for the grade, starting condition, section, geometry and target properties.
How are surface condition and distortion controlled?
Vacuum heating, load support, recipe control, transfer timing and oil condition work together to control the result. Trial loads establish the process window for your material, geometry and inspection requirements.
Can gas cooling be added to the VTO family?
A 2 bar gas-cooling option is available on configured VTO systems, allowing the cooling route to be matched to different materials and production requirements.
What determines the correct VTO model?
Model selection considers fixture envelope, batch mass, heating power, transfer arrangement, production cycle, oil circulation, utilities and acceptance scope.
Engineering configuration for your production load
Provide the material grade, part drawing, batch envelope, mass, target hardness, dimensional limit, oil requirements and production volume for a tailored technical proposal.