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TENGHUI provides custom sheet metal bending services for brackets, channels, panels, trays, chassis, enclosure bodies, cylinders, and other bent metal parts.
CNC press brake bending, hemming, offset bending, large-radius bending, and roll bending are available for one-off prototypes, low-volume projects, and production orders. For standard-sized parts, critical bent dimensions can typically be controlled within ±0.15 mm to ±0.2 mm, depending on the material, sheet thickness, bend length, and part geometry.
Send your 2D drawings and 3D CAD files for a bending feasibility review and quotation.
We utilize a diverse range of bending techniques to form complex 3D shapes from flat sheet metal. By matching the right bending method to your design, we ensure maximum structural strength, precise angles, and zero cosmetic damage.
CNC press brakes with programmable backgauges control bend positions, flange dimensions, and angles for custom brackets, panels, channels, covers, and enclosures.
Multiple bends are combined to produce trays, chassis, boxes, frames, and bodies. Sequences are planned to maintain tool access and control tolerance accumulation.
Offset and joggle bends place two sections of a sheet on parallel planes, commonly used to create clearance for overlapping panels, mounting features, and mating parts.
Open, closed, and teardrop hems improve edge safety, stiffness, appearance, and assembly performance based on sheet material, thickness, and bend direction.
Large radii are produced with specialized tooling or a sequence of closely spaced bends, ideal for curved guards, covers, and transition components.
Roll bending produces continuous curves, cylinders, sleeves, cones, and radius panels. Achievable roundness depends on material geometry and seam design.
We utilize CNC Press Brakes and high-performance hydraulic bending machines to process aluminum, stainless steel, carbon steel, and copper. CNC automation ensures that back-gauge positioning and depth control are held to extreme tolerances across every batch.
Closed-loop servo positioning ensures exact flange depth and strict angle consistency along the entire bending length.
Dynamic deflection compensation eliminates center bowing on long parts, maintaining consistent degrees from end to end.
Hardened precision ground punches and non-marring urethane film dies for cosmetic aluminum and polished stainless sheets.
Equipped with multi-axis CNC crowning and precision segmented dies to eliminate bending deflection and protect cosmetic surfaces across large volume batches.
| Requirement | Typical Capability | Important Considerations |
|---|---|---|
| Critical bent dimensions | ±0.15 mm to ±0.2 mm | Material, thickness, bend position and geometry |
| Bend angles | Drawing review required | Springback, bend length, tooling and material condition |
| Multi-bend components | Drawing review required | Tolerance accumulation, bend sequence and datum selection |
| Long or large components | Drawing review required | Bend length, material flatness and part weight |
| Large-radius bends | Drawing review required | Radius-to-thickness ratio, tooling and springback |
| Rolled diameter and roundness | Drawing review required | Material, thickness, width, seam and geometry |
Dimensional consistency and acute bend angles depend on the dynamic interaction between raw material properties, tooling geometry, springback calculation, and CNC execution.
Material grade, temper, hardness, and actual sheet thickness directly affect the required bending tonnage, inside radius, springback behavior, flange position, and finished dimensions.
After the bending force is removed, the metal partially returns toward its original shape. The amount of elastic springback varies significantly with material yield strength, thickness, radius, and grain.
The natural inside radius is determined by sheet thickness, punch tip radius, and the V-die opening width. Impractical tight radius specs cause outer tensile cracking, severe tool marks, or dimensional drift.
Bending parallel to the rolling grain direction substantially increases surface cracking risks, especially in temper-hardened aluminum and high-strength steels. Transverse bending orientation is always preferred.
The order of multiple bends directly affects gauge tool access, datum control, flange clearance, and cumulative tolerance stack-up. Deep channels and complex returns require systematic sequence planning.
Proper punch and die selection, back-gauge finger clearance, goose-neck punch clearance for return flanges, and stable tool contact areas all dictate overall repeatability and cosmetic edge appearance.
From highly ductile soft aluminum to high-strength stainless alloys, we select matched punch radii, V-die ratios, and bend deductions (K-factor) for crack-free forming.
SPCC, DC01, SPHC, Q235, Q355
Cold-rolled SPCC bends easily with smooth cosmetic surfaces. Heavier hot-rolled plates require higher tonnage and scale cleaning.
SUS301, SUS304, SUS316, 316L
Exhibits higher yield strength and pronounced springback compared to carbon steel. Requires over-bending angle compensation and protective film to prevent die marks.
5052, 5754, 6061, 6063, 7075
5052 forms excellently with tight radii. Heat-treated 6061-T6 and 7075 require larger internal radii and transverse grain orientation to eliminate bend cracking.
SECC (Electrolytic), SGCC (Hot-Dip)
Tooling surfaces and handling must be optimized to preserve the protective zinc coating and avoid surface flaking along acute bend seams.
T2 Pure Copper, C110, H62, H65 Brass
Pure copper is highly malleable for complex busbars; half-hard brass requires calibrated radius tooling to prevent stress fractures on tight 90° corners.
Following standardized bending DFM practices ensures tool repeatability, eliminates corner tearing, protects cosmetic faces, and lowers manufacturing setup costs.
Using the same inside bend radius throughout a component reduces tooling changes, machine setup time, and dimensional variation.
Minimum practical radius depends on material grade, temper, thickness, grain, and method. Tight radii can cause cracking, thinning, or tool marks.
Holes, slots, and cutouts placed too close to a bend line will stretch, distort, or shift out of tolerance during the forming stroke.
Bend reliefs help reduce tearing, bulging, and material interference where a bend line terminates at an edge or an adjacent flange.
A flange must be long enough to sit securely across the die opening during bending. Minimum length depends on sheet thickness and V-die size.
Deep returns, narrow U-channels, and closely spaced bends may collide with press brake punch tooling. 3D models allow early clearance simulation.
Light tool marks can occur during forming. Clearly specify Class-A visible exterior faces, protective film needs, and acceptable mark limits on drawings.
Specify functional dimensions in the final bent state using clear datums. Avoid defining every critical tolerance strictly on the flat unfolded pattern.
From simple single-bend structural brackets to complex multi-flange enclosures, explore the most common geometries formed in our facility.
Standard and custom shaped brackets designed for structural mounting, load support, and accurate internal component positioning.
Rigid channel sections and open profiles offering high load-bearing capacity for machine structural frames, rails, and sub-assemblies.
Clean-finished equipment faceplates, side access panels, and protective safety guards engineered for machinery enclosures and industrial devices.
Multi-bend electrical chassis, instrument boxes, and custom housing bodies built for internal electronic shielding and component protection.
Precision-bent sliding trays, battery holders, and internal support skeletons designed specifically for modular racks and cabinetry.
Panels featuring parallel joggle or offset bends to create flush clearance for overlapping door seams and interlocking sheet joints.
Roll-formed cylindrical sleeves, pipes, and sweeping radius protective guards produced via continuous forming and roll-bending processes.
Specialized tapered cones and fluid or airflow transition ducts fabricated for complex HVAC systems, hoppers, and exhaust ducting.
Sheet metal bending uses controlled mechanical or hydraulic force to permanently form a flat metal sheet along one or more straight or curved axes. CNC press brake bending is widely used to manufacture precision brackets, channels, panels, sliding trays, electronic chassis, and enclosure bodies.
Our complete range of forming solutions includes:
For standard-sized metal components with conventional thicknesses, our critical bent linear dimensions can typically be held within ±0.15 mm to ±0.2 mm, with angular tolerances within ±0.5° to ±1°. Final achievable limits depend on raw material temper, sheet gauge, overall bend length, and cumulative bend stack-up.
There is no universal minimum bend radius. It is dictated by the alloy grade, material temper (e.g., 5052-H32 vs. 6061-T6), sheet thickness, rolling grain direction, and punch tip radius. As a general rule of thumb, an inside radius equal to sheet thickness ($R \ge T$) prevents cracking, while tighter radius requirements must undergo individual engineering review.
Springback occurs because metals undergo elastic recovery once punch pressure is released. The springback angle varies based on tensile yield strength, thickness-to-radius ratio, sheet grain orientation, and tooling geometry. We compensate for springback dynamically using calibrated CNC angle-correction algorithms and precision V-dies.
Yes, but features located inside the bend deformation zone will stretch into oval shapes, flare out, or tear. We recommend keeping hole edges at a minimum distance of 2.5 × thickness + R from the bend line. Where tight spacing is unavoidable, adding tear relief slots helps isolate and preserve feature geometry.
Yes. We routinely manufacture multi-bend brackets, U-channels, sliding trays, multi-sided chassis boxes, and structural framework. Our team conducts 3D collision simulations prior to bending to confirm tool clearances, prevent machine interference on return flanges, and minimize cumulative tolerance build-up.
Light contact friction marks naturally occur where the workpiece slides across the die shoulders during the stroke. For cosmetically critical parts (such as brushed stainless steel, anodized aluminum, or pre-coated sheets), please specify cosmetic requirements on drawings so we can utilize protective urethane film or specialized non-marking tooling.
Yes. Roll forming is available for complete cylindrical pipes, wrap sleeves, curved safety guards, and architectural radius panels. Achievable diameters, cylindricity, and roundness depend directly on metal alloy type, sheet thickness, rolling length, and whether longitudinal weld seams are required.
To ensure an accurate quote and comprehensive DFM feasibility check within 24 hours, please submit:
If you have any questions or would like to book a session please contact us.
Once we receive your design files, our senior manufacturing engineers will manually perform a comprehensive DFM review and deliver an accurate, optimized quote within 24 hours.
