Optimizing the Bending of Molybdenum Rods: Strategies for Maximizing Accuracy

Optimizing the precision of molybdenum rod bending is a complex process involving multiple aspects, requiring comprehensive consideration of material properties, process parameters, and equipment performance. The following strategies aim to maximize the accuracy of molybdenum rod bending:

1. Material Selection and Preparation

  • Material Properties: Firstly, high-quality molybdenum rods should be selected to ensure good plasticity and toughness during the bending process. Additionally, molybdenum alloy rods doped with appropriate amounts of other elements (such as boron) can be considered to further enhance their bending performance. Research shows that adding 0.5-5% boron powder by mass can refine grain sizes, increase grain boundary strength, and thus improve the mechanical properties of the alloy (Reference Article 2).
  • Material Pretreatment: Before bending, necessary pretreatments should be applied to molybdenum rods, such as removing surface defects and cleaning oil stains, to reduce stress concentrations and crack formation during bending.

2. Optimization of Process Parameters

  • Temperature Control: Bending temperature is a critical factor affecting the precision of molybdenum rod bending. Prior to bending, high-frequency heating equipment should be used to heat the molybdenum rods to an appropriate temperature (e.g., 800-1000°C) to soften the material, reduce its yield strength, and thereby improve bending formability (Reference Article 2). It is important to note that the heating temperature should not be too high to avoid grain growth, which can reduce ductility and plasticity.
  • Bending Rate and Angle: Controlling the bending rate and angle is also an effective means of improving bending precision. During the bending process, the bending rate should be kept stable to avoid stress concentrations caused by sudden accelerations or decelerations. Additionally, the bending angle should be precisely controlled according to actual requirements to ensure dimensional accuracy of the bent parts.
  • Rolling Process: Before bending, molybdenum rods can be rolled to eliminate internal stresses and improve material uniformity. Two-way rolling should be employed to prevent bending fracture caused by material anisotropy (Reference Article 2). Moreover, controlling the deformation rate per pass and total deformation should further enhance the bending performance of the material.

3. Equipment and Die Selection

  • Bending Equipment: Selecting high-precision, high-stability bending equipment is crucial for ensuring bending precision. The equipment should possess good rigidity and precision retention to minimize vibrations and deformations during bending.
  • Die Design: Die design should fully consider the material properties and bending requirements of molybdenum rods. The shape, size, and material of the dies should be precisely matched to the molybdenum rods to reduce friction and wear during bending. Furthermore, the dies should exhibit excellent wear resistance and high-temperature resistance to ensure long-term stability and reliability.

4. Post-Bending Treatment and Inspection

  • Annealing Treatment: After bending, molybdenum rods should undergo annealing treatment to eliminate residual stresses generated during bending and improve material toughness. Annealing temperature and time should be selected based on the actual material conditions (e.g., 700-900°C for 1-2 hours, Reference Article 2).
  • Quality Inspection: Finally, rigorous quality inspections should be conducted on the bent molybdenum rods, including dimensional accuracy, surface quality, and mechanical properties. Inspections can help identify and rectify issues promptly, ensuring that the quality of the bent parts meets requirements.

In summary, optimizing the precision of molybdenum rod bending involves multiple aspects, including material selection and preparation, optimization of process parameters, equipment and die selection, and post-bending treatment and inspection. By comprehensively applying these strategies, significant improvements in bending precision and yield rates can be achieved.