Double Line Annealing Furnace | Metal Wire Heat Treatment

    Annealing of metal wire is a critical process for improving internal grain structure, enhancing wire flexibility, and eliminating processing-induced stress. The uniformity of heat exposure during annealing directly determines the overall quality of the finished product. Only when the entire wire is uniformly annealed can optimal wire quality be achieved. This process is widely used in the processing of precious metal jewelry, precision stainless steel wire, copper alloy cables, titanium alloy microwires, and other related fields.

    Traditional single-wire annealing furnaces suffer from a limited heating zone and a single wire-passing channel, making them highly susceptible to uneven localized heating and significant grain differentiation between the inner and outer layers of the wire. This not only results in poor annealing uniformity and unstable quality control, but also leads to limited production capacity and high energy consumption per unit output, making it difficult to meet the demands of modern large-scale and flexible manufacturing.

    The dual-wire annealing furnace adopts a dual-channel parallel heat treatment structure, combined with a fully integrated uniform hot-air circulation heating system. The temperature field inside the furnace is balanced and stable, ensuring that every wire receives consistent heat throughout the entire process, achieving full-length annealing uniformity. This fundamentally optimizes the grain recrystallization effect and delivers superior wire quality. Coupled with full-process atmosphere protection and a PLC-based intelligent control system, it completely overcomes the production bottlenecks of traditional equipment, establishing itself as the mainstream upgrade choice in the wire heat treatment industry. The following sections provide a comprehensive analysis of its core advantages and industry value, based on equipment structure and application scenarios.

◉1. Doubled Production Capacity, Significantly Reduced Unit Costs, and Stable Uniform Annealing Quality

Compared to traditional single-wire annealing furnaces, the dual-channel synchronous wire-feeding design directly doubles production efficiency. Under the same working hours and identical labor and energy input, finished product output is doubled, substantially reducing the per-meter processing costs for labor, electricity, and protective gas consumption.

The furnace's fully uniform heating structure ensures consistent annealing quality across both channels. Even during large-scale continuous production, there is no temperature or hardness variation among wires, enabling sustained, stable output of highly consistent workpieces with superior wire quality.

For high-value materials such as precious metal wires and precision stainless steel wires, the increased capacity significantly shortens order delivery times and enhances the factory's ability to handle orders, maintaining stable and uniform annealing quality even in mass production.

◉2. Dual-Channel Independent Temperature Control for Flexible Production, Ensuring Uniform Annealing with Precise Channel-Specific Regulation

The two heating channels are equipped with independent heating modules and temperature control systems, achieving a temperature control accuracy of up to ±1°C. The two processes do not interfere with each other, and each channel maintains a constant and balanced temperature field, ensuring that every wire is uniformly annealed from end to end. Independent temperature control for each channel allows two different wire specifications to be processed simultaneously without mutual interference, both achieving uniform heating and superior wire quality.

Factories can process thick copper cables in one channel while handling ultra-fine gold or silver jewelry wires in the other, without needing to shut down for equipment changeovers or process adjustments. Changeover and commissioning time is reduced by 70%. Whether thick or thin wires, uniform annealing is achieved, making this system perfectly suited for flexible production modes involving multiple styles and small batches, such as jewelry and precision electronic components, with high-quality finished products produced concurrently for different wire categories.

◉3. Sealed Atmosphere Protection for Bright, Oxidation-Free Surfaces, with Uniform Atmosphere Enhancing Annealing Consistency

The fully enclosed furnace chamber, combined with a closed-loop atmosphere circulation system, ensures uniform circulation of inert gas throughout the furnace. This not only isolates oxygen to prevent oxidation but also works with the stable temperature environment to achieve synchronized uniformity in both heat exposure and gas contact. The entire wire is annealed evenly, with complete and consistent grain recrystallization, resulting in superior wire quality. Post-annealing secondary polishing is unnecessary, as the wire surface remains bright and clean.

Additionally, high-temperature insulation cotton wraps the furnace body, minimizing heat loss. Compared to older equipment, gas consumption is reduced by 30%. The stable, constant-temperature, sealed environment consistently maintains uniform annealing conditions, balancing product quality with energy efficiency, while reducing subsequent polishing steps and saving consumables and labor.

◉4. Intelligent Tension Control System for Reduced Wire Scrap, Further Enhancing Quality with a Uniform Temperature Field

The equipment is equipped with multiple precision tension wheels and automatic correction assemblies along the entire line. The two channels independently regulate wire tension, effectively preventing issues such as stretching deformation, breakage, and diameter inconsistency in fine wires. The wire runs smoothly without deviation, avoiding localized overheating or insufficient heating, ensuring uniform annealing along the entire wire length and superior quality.

A visual touchscreen provides real-time monitoring of wire feed speed, furnace temperature, gas flow, and tension values, with automatic alarms for abnormal conditions. The combination of stable wire feeding and a uniform temperature field improves the yield rate by over 15%, significantly reducing material loss for precious metals and specialty alloys. Each batch achieves consistent annealing uniformity, ensuring stable finished product performance.

◉5. Integrated Compact Design for Easy Installation and Maintenance, Delivering Sustained and Stable Uniform Annealing Quality

The machine integrates heating, cooling, electrical control, and gas circuit modules into a single unit. Its integrated frame with movable universal casters occupies only 60% of the floor space required by two single-wire furnaces, saving valuable workshop area. Modular component design allows for easy disassembly and replacement of heating tubes, seals, and control valves, simplifying routine maintenance. Over long-term operation, the temperature field remains stable and resistant to drift, consistently maintaining uniform annealing conditions and continuously ensuring superior wire quality.

The fully automatic control system supports recipe storage for process parameters. With one-touch recall of proven annealing curves—which include preset uniform heating, soaking, and slow-cooling parameters—standardized uniform annealing can be initiated with a single press. Even novice operators can quickly master the system, reducing technical skill requirements and eliminating quality issues caused by manual operation errors.

At present, the dual-wire annealing furnace has fully covered three major mainstream processing sectors: precious metal jewelry wire processing, precision electronic alloy microwire production, and copper wire treatment for electrical cables. Relying on its dual-channel balanced temperature field design, the equipment consistently achieves uniform wire annealing, continuously producing finished products with consistent performance, good flexibility, and no internal stress, delivering superior wire quality. Against the broader backdrop of energy conservation, efficiency improvement, and the transition to intelligent manufacturing in the industry, annealing equipment that features low energy consumption, high productivity, digitalization, and the ability to stably deliver uniform heat treatment has become the top choice for factory technological upgrades.