High Precision Vacuum Furnace

This high-precision vacuum furnace is a custom high-end thermal processing equipment specially developed for vacuum hot-press forming of large-size optical fiber panel preforms. Integrating high-tightness vacuum sealing, precision temperature control, uniform heat preservation and stable cooling structure, the equipment fully meets the stringent technical requirements of vacuum melting and pressure forming for optical composite materials. It effectively eliminates common defects such as image distortion, dark spots and inconsistent optical performance of workpieces, ensuring excellent dimensional accuracy and optical quality. As core intelligent manufacturing equipment, it is widely applied in the precision processing of advanced optical new materials.

1. Advanced Furnace Body System with High Sealing and Heavy Load Capacity

The furnace adopts a three-layer split shell structure with reliable structural stability and convenient disassembly and maintenance. The outer and middle shells are welded of 304 stainless steel, featuring corrosion resistance and smooth surface. The inner heating chamber is integrally welded with high-performance 310S stainless steel plate, which resists high-temperature deformation, oxidation and peeling, maintaining an ultra-clean internal environment and avoiding contamination of precision workpieces. The effective constant temperature zone reaches φ800mm×600mm, supporting batch forming of large-size optical fiber panels.

Equipped with O-ring sealing and water-cooled flange structure, the furnace lid achieves excellent airtightness and prevents high-temperature aging of sealing components. The vacuum rise rate is ≤2Pa/h and the inflation pressure is ≤0.05MPa, maintaining a stable high-vacuum working environment. The furnace bottom adopts a thickened steel plate structure with a thickness of more than 30mm, equipped with a professional mold positioning device to ensure accurate centering and coaxial alignment with the pressure rod, effectively eliminating forming deviation. The bottom bearing platform can withstand 100-ton pressure without deformation, fully adapting to high-strength hot-press molding processes.

The vacuum heating kettle is made of high-temperature, corrosion and pressure-resistant alloy material, which resists strong acid corrosion generated during technological reactions and supports long-term continuous heavy-duty operation. The split flange connection design enables independent disassembly and overhaul of the inner heating liner, greatly reducing maintenance costs. During long-time operation, the surface temperature of the furnace shell is controlled within ambient temperature +20℃, ensuring safe and energy-saving production.

2. Precise Heating, Heat Preservation and Cooling System

Designed for energy conservation and high precision, the heating system supports a maximum working temperature of 750℃ with a heating rate of ≥15℃/min, realizing fast and efficient temperature rise. It adopts upper, middle and lower three-point independent temperature control, equipped with double-spiral resistance wire heating structure, which effectively eliminates magnetic field interference inside the chamber and improves temperature uniformity. The thermocouples are firmly fixed and easy to replace for daily maintenance.

The furnace delivers superior temperature control accuracy. The instrument control precision reaches ±0.5℃, and the overall temperature uniformity is ≤±3℃, with authoritative third-party inspection reports available. For temperatures above 500℃, the temperature deviation is controlled at -3~0℃ at a heating rate of 5℃/min, and less than ±1℃ at 1.5℃/min. The heating power is intelligently limited within 80% during heating and 50% during heat preservation, realizing low-energy and stable operation. The heating elements feature low outgassing, high oxidation resistance and a service life of more than 3 years.

The heat preservation system adopts an upper and lower segmented structure with high-quality alumina fiber blocks, providing excellent thermal insulation performance. The bottom adopts an I-shaped reinforced load-bearing structure that can withstand 80-ton pressure without deformation, ensuring stable connection with the pressing machine. The internal thermal insulation filling effectively reduces heat loss, further improving internal temperature uniformity and overall energy efficiency.

3. Product Advantages and Applications

This vacuum furnace integrates high vacuum tightness, heavy load resistance, ultra-precise temperature control and stable operation. Its modular structure enables easy maintenance and low energy consumption. With full-process clean processing, it perfectly matches vacuum hot-press forming and thermal curing processes for optical fiber panels and composite materials. Real-time controllability of temperature, vacuum degree and pressure greatly improves product qualification rate and process stability. It is an ideal precision processing equipment for optical new materials, composite material manufacturing and high-end intelligent production lines.