Round Tubular Heater Bending Processing Specification: Avoid Cracking & Insulation Damage
Round tubular heaters need diversified bending processing to adapt to complex equipment space layout, but irregular bending operation often causes hidden structural damage. Many processed heaters have no obvious surface cracks, but internal insulation layers have been fractured and layered, leading to local overheating and short circuit failure after power-on. Standard bending processing specifications can retain the structural advantages of circular tubes and eliminate internal hidden dangers.
The circular symmetrical structure of round tubular heater determines its excellent bending performance, with uniform stress distribution during bending and no concentrated stress point. Compared with square and special-shaped tubes, circular tubes will not produce corner extrusion and layer separation during shaping, with higher processing tolerance. But excessive bending angle, too small bending radius and forced bending will still cause tube wall thinning, internal magnesium oxide powder cracking and heating wire displacement.
Different tube diameter specifications have matched minimum bending radius standards. Excessively small bending radius will cause irreversible damage to internal structure. Thin-diameter small tubes have flexible bending performance and can adapt to small-angle dense bending; thick-diameter heavy-duty tubes have high structural rigidity and require larger bending radius to avoid structural damage. Dry-burning and liquid-heating tubes also have different bending allowances due to different internal filling compactness.
Post-bending inspection is an essential link to ensure processing quality. Surface appearance inspection checks for tube wall cracking, wrinkling and deformation; insulation resistance detection verifies whether internal insulation layer is damaged; power-on test confirms uniform heat output without local overheating. Unqualified bending processing will leave long-term hidden dangers for equipment operation.
Standard bending processing parameter specification table is sorted below:
|
Tube Diameter Specification |
Minimum Bending Radius |
Allowable Bending Angle |
Processing Precautions |
|---|---|---|---|
|
3mm-6mm Mini Tube |
≥15mm |
0-180° arbitrary bending |
Avoid repeated bending at the same position |
|
8mm-12mm Conventional Tube |
≥30mm |
0-180° standard bending |
Uniform force during bending, no extrusion deformation |
|
14mm-20mm Medium Tube |
≥50mm |
0-120° conventional bending |
Prevent internal powder layering and cracking |
|
25mm-30mm Heavy Tube |
≥80mm |
Fixed large-angle bending |
Professional mechanical bending processing required |
According to processing experience, standardized bending processing can ensure 100% integrity of internal insulation structure and heating core. Non-standard bending will cause latent faults that cannot be detected by appearance, which will gradually expose during long-term temperature cycling operation.
Professional customized bending processing scheme can formulate exclusive bending parameters and shaping modes according to tube diameter and equipment space layout, ensuring that the processed tubular heater has complete structural performance and stable heating effect.
