CNC Press Brake & Sheet Metal Bending Job Work Vasai - Mumbai - Palghar

CNC press brake bending is a sheet metal forming operation where a hydraulic press brake forces a punch into sheet material positioned over a V-die to produce a precise angular bend. The bend angle, back gauge position, and punch travel depth are all controlled by a CNC controller — eliminating manual setting errors and producing consistent angular accuracy across the full batch. At Aero Enterprises Unit I, Vasai Phata, CNC press brake bending handles material from 0.5mm to 8mm MS and 5mm SS in CR IS 513, HR IS 2062, GI IS 277, SS 304, SS 316, aluminium, brass, and copper.

A CNC bending machine — or CNC press brake — works by clamping sheet metal between a punch (top tool) and a V-die (bottom tool) and applying controlled press force to form a precise bend angle. The CNC controller manages three variables: punch travel depth (which controls the bend angle), back gauge position (which controls flange length), and press speed. The back gauge positions automatically between bends for multi-bend sequences, meaning the operator loads the blank and the machine produces every bend in the programmed sequence without manual measurement. At Aero Enterprises Unit I, the CNC press brake is a 100T / 3100mm machine with multi-axis back gauge.

A multi-axis CNC back gauge positions the sheet metal precisely before each press stroke — controlling the X axis (front-to-back depth) and Z axes (left-right position) independently. This allows the machine to reposition automatically between bends on a multi-bend profile without manual measurement or operator repositioning between strokes. The result is consistent flange lengths and cumulative angular accuracy across complex bend sequences that single-axis or manual back gauge machines cannot reliably maintain.

Air bending controls the bend angle by punch penetration depth — the sheet does not contact the full die surface, which allows one die set to produce multiple angles. It is the standard method for most sheet metal bending work. Bottom bending forces the sheet fully to the die floor, coining the bend zone and eliminating springback variation — correct for tight-tolerance profiles where air bending angle variation across the batch is not acceptable. At Aero Enterprises Unit I, the correct method is selected based on material grade, thickness, angular tolerance, and batch volume.

Springback is the elastic recovery of sheet metal after bending force is released — the bend angle opens slightly from the intended angle. Springback magnitude varies by material grade, thickness, temper, and bend radius. At Aero Enterprises Unit I, springback compensation values for each material and thickness combination are programmed into the CNC press brake controller using K-factor bend allowance data. First-off angular verification confirms the compensation is correct before batch production begins.

CNC press brake bending at Aero Enterprises Unit I handles CR IS 513 (CQ, DQ, DDQ), HR IS 2062, GI IS 277, SS 304, SS 316, aluminium, brass, and copper. Material thickness range is 0.5mm to 8mm for mild steel and up to 5mm for stainless steel on the 100T CNC press brake. All material enters production from JSW and TATA primary certified coils verified against Mill Test Certificates at Unit II Dhumal Nagar.

CNC press brake bending at Aero Enterprises Unit I achieves ±0.5° angular tolerance across the full 3100mm bed length with ±0.01mm back gauge positioning repeatability. First-off angular inspection using a calibrated digital protractor is performed on all bend angles before batch production is approved on every job.

Minimum internal bend radius is a function of material grade and thickness. For CR IS 513 CQ grade, minimum internal radius is 1.0× material thickness. For HR IS 2062, minimum is 1.5× material thickness. For SS 304 and SS 316, minimum is 1.0× material thickness due to work hardening characteristics. Bending below the minimum radius for the grade causes fracture or cracking at the bend zone. At Aero Enterprises Unit I, minimum bend radius is confirmed against the material certificate before tooling is selected.

Yes. The standard production sequence at Aero Enterprises Unit I is stamping or laser cutting first — producing all holes, slots, and blank profiles — followed by CNC press brake bending. Pre-punched components are bent with hole pattern orientation referenced to back gauge position to maintain the relationship between hole centres and bent flanges. This is the correct sequence for enclosure bodies, bracket profiles, and structural frames where hole-to-flange dimensional accuracy is a specification requirement.

Aero Enterprises Unit I processes CNC bending job work from 50 pieces upward for repeat profiles where a bend programme already exists. New profiles require first-off setup and programme creation — performed on the first order and retained for all repeat production. For prototype and design validation, single pieces and small batches are accepted with a setup charge. Clients supplying DXF files with bend sequence notation reduce setup time and cost significantly.