On a press brake, the frame is where the machine’s accuracy lives. The bed and the ram have to stay parallel along the full bending length, under load, for the life of the machine — and on a welded steel frame, that parallelism is decided by the fabricator, not by the design alone.
VHOFAB manufactures heavy welded steel frames and machined components for press brake builders, shear and folding machine manufacturers, and machine rebuilders. Components are produced to the customer’s drawing, with the critical surfaces machined after welding — the step that determines whether the finished frame will hold its tooling fits and bend consistently.
What We Manufacture
Welded and machined components for bending and shearing equipment, produced to drawing:
- Side frames and housings — the main structural members that carry the bending load, cut from heavy plate and welded into a rigid assembly.
- Beds (lower beams) — the member that supports the lower tooling, where the top surface has to be flat and true along the full length.
- Rams and sliders (upper beams) — the moving member, where the tooling seat and the guiding surfaces decide how consistently the punch lines up with the die.
- Upper beams and crowns — structural members carrying the ram or the hydraulic cylinders.
- Tool holders and tooling seats — machined seats and clamping surfaces for punches and dies.
- Base plates, mounting plates and backgauge supports — machined plates and weldments that position assemblies on the frame.
Components can be supplied as welded assemblies or as finished, machined components, depending on the stage your production line needs. One-off frames and repeat series are both planned the same way — from the drawing.
The Process Chain, in One Workshop
Cutting, welding and machining are carried out under one roof, which matters because the sequence between them is what makes the finished frame accurate:
- Plate cutting — profiles and blanks cut from heavy plate by flame, plasma or laser cutting, with machining allowance left where the drawing requires it.
- Fit-up and welding — side frames, beds and rams welded into assemblies, with the weld sequence planned to manage distortion.
- Post-weld machining — the surfaces that carry the machine’s accuracy — bed top surfaces, ram and slider seats, tooling seats and mounting faces — machined after welding, so that the final geometry is established on the finished structure rather than on parts that welding will later move.
- Inspection — the machined surfaces are checked against the drawing before the component leaves the workshop.
Why Post-Weld Machining Decides the Frame
Welding moves steel. Even when every plate is cut and fitted correctly, a welded frame will distort — joints pull as they cool, and the longer the weld runs, the more the structure moves. On a press brake frame, that movement lands exactly where the machine cannot afford it: the bed-to-ram relationship and the tooling seats.
This is why the critical surfaces on a bending machine frame are machined after welding. The bed’s upper surface, the ram’s lower surface and the tooling seats are produced on the welded structure, so that the parallelism and flatness that the machine’s accuracy depends on are established once the distortion has already happened — not before, when it can still be undone by the next weld.
Machining the frame after welding is also what makes the tooling fits work: a punch holder seat that is not square to the bed will show up as inconsistent bends, no matter how good the rest of the machine is. The engineering behind this sequence, and how tolerances stack through cutting, welding and machining, is covered in heavy fabrication tolerances and heavy plate processing.
Why This Work Is Hard for a General Fabricator
A press brake frame looks like a large steel weldment, and it is — but it has requirements that most general fabrication shops are not equipped to meet:
- Stiffness comes from geometry, not plate thickness. A frame that deflects under load bends the work inconsistently. Making it stiff by adding plate thickness is expensive and often less effective than getting the section geometry right — which starts on the drawing, see welded frames and equipment bases.
- Distortion control across a large weldment. The bigger the frame, the more the welding pulls it. Sequence, restraint and heat input have to be planned, not improvised.
- Machining capacity for large, heavy components. The bed and side frames of a press brake are long, heavy parts that have to be set up and machined accurately. Not every machine shop can do this, and the ones that can have to plan the setup so the critical surfaces are produced in as few setups as possible.
- Handling between every step. Cutting, welding and machining a multi-tonne frame means lifting, turning and transporting it without losing the reference surfaces — which is why keeping all three processes in one workshop removes the handovers where accuracy gets lost.
Inspection and Documentation
Before a frame is packed, the features that carry the machine’s accuracy are verified against the drawing — dimensional checks on the machined surfaces, and geometry checks such as flatness and parallelism on the surfaces where the drawing requires them. Inspection records can be supplied with the order, and third-party inspection is welcomed where the buyer’s quality system requires it. How this is done — material traceability, stage inspection and final checks — is set out in quality and inspection.
The Workshop
VHOFAB has fabricated heavy steel components for industrial equipment since 2019. The workshop covers 8,800 m², with a monthly capacity of 2,000 tonnes and a maximum plate thickness of 300 mm, worked by more than 60 employees. Cutting, welding, CNC machining and assembly are carried out under one roof, so a frame’s route — cut, weld, machine, inspect — is planned as a single sequence rather than handed between suppliers.
Who We Work With
- Press brake and shearing machine builders — producing new machines, sourcing frames, beds, rams and machined components to their own drawings.
- Rolling and folding machine manufacturers — heavy welded structures with machined critical surfaces.
- Machine rebuilders and retrofitters — replacement frames, beds and components for machines being restored or upgraded.
- Equipment manufacturers generally — any builder who needs a welded steel frame with machined accuracy, not just a weldment.
Send the Drawing
Send the drawing and technical requirements through the contact form for a manufacturing review. We will review the component, confirm where machining should sit in the sequence, and quote against the delivery stage you need — welded assembly or finished component. See also CNC machining for heavy steel components for the machining side of the work.