PARTIAL ANNEALING MACHINE RM-147

General Description

The RM-147（35–80）KW Short-Circuit Annealing Machine is a high-efficiency industrial system specially designed for the heat treatment of electric heating tubes and metallic resistors.

During the manufacturing process of heating elements — such as those used in water heaters, electric boilers, industrial furnaces, kitchen appliances, and laboratory equipment — the metal tubes undergo mechanical deformation and surface hardening caused by bending or powder filling.

Annealing softens and stabilizes the metal through a controlled heating and cooling process, eliminating internal stresses and restoring the tube’s original ductility and elasticity.

Equipped with an electronic power control system (35–80 KW), the RM-147 ensures uniform heat distribution along the tube. It can perform full-length or partial annealing, adapting to specific production requirements.

For enhanced productivity, the machine can be integrated with automatic feeding and unloading systems, turning it into a fully automated production line, minimizing handling time and operator error.

Technical Specifications

Advantages and Benefits of Annealing

1. Elimination of Internal Stresses

During tube bending, mechanical stress builds up, which can cause cracking or deformation. Annealing releases these stresses, stabilizing the metal’s structure.

Example: In stainless steel spiral heating elements, annealing prevents micro-cracks when bending tight curves or “U” shapes.

2. Improved Ductility and Flexibility

The process restores the metal’s ability to deform without breaking, allowing tighter bends without failure.

Example: In immersion heaters, tubes can be bent with small radii without surface cracking.

3. Extended Product Lifespan

Annealed tubes better withstand thermal expansion cycles, reducing the risk of fracture or fatigue under continuous high-temperature operation.

Example: Annealed heating elements last significantly longer in industrial heaters exposed to constant temperature variations.

4. Better Thermal Conductivity and Electrical Stability

The stabilized metal structure ensures uniform heat distribution and enhances the heating element’s energy efficiency.

5. Uniform and Clean Surface Finish

The RM-147 produces smooth, stress-free surfaces without oxidation or discoloration, improving both performance and product appearance.

6. Customizable Process – Full or Partial Annealing

The machine can be configured for localized annealing, ideal for products requiring only specific areas to be softened.

Example: In coffee-maker heating elements, only the curved sections are annealed while keeping the rest of the tube rigid.

7. High Productivity and Automation

The system can process up to four tubes simultaneously and can be automated for continuous production.

Example: In mass production of “U”-type heating elements, the operator only supervises the process, reducing labor time and cost.

Applications

1. Manufacturing of electric heating elements for home appliances and industrial equipment.

2. Production of stainless steel, copper, and alloy heating tubes.

3. Heat treatment of metal parts to improve formability and thermal fatigue resistance.

4. Integration into automated heating-element production lines.