Fixed Beam Gantry Type Milling Machine

The GFA-2550R uses a fixed gantry frame and moving worktable, giving the machine a long working area while keeping the main gantry structure stationary. The main castings are made from high-strength cast iron, with reinforcing ribs designed through finite element analysis and heat treatment applied to reduce residual stress. For buyers looking for a fixed beam gantry type milling machine for large components, this layout provides a direct combination of long X-axis travel and a 22-ton worktable capacity.

The spindle assembly uses a 400 × 400 mm enclosed square ram. A servo motor drives the ZF gear transmission directly, while the gearbox connects to the spindle through a high-torque coupling. The spindle and gearbox have a separate oil-cooling system to remove generated heat and reduce thermal deformation around the milling head.

The X and Y axes use heavy-duty roller linear guideways, while the Z axis uses a hardened box-way structure with plastic-coated contact surfaces. X/Y/Z axes are driven by large-lead precision ball screws through servo motors and direct-connected reducers. A nitrogen-cylinder balancing system is fitted to the Z axis to offset the ram's weight and reduce unnecessary load on the ball screw.

Final machine configuration and technical specifications are subject to the signed technical agreement.

For this model, the working envelope is one of the main practical considerations. The 5200 mm X-axis travel and 5000 mm table length give the machine enough longitudinal movement for long components, while the 22-ton table capacity allows heavier parts to be loaded without moving them to a separate setup.

The spindle arrangement is also different from a high-speed machining configuration. The 20–4500 rpm speed range is paired with a ZF gearbox and up to 1672 N·m maximum torque. This makes the GFA-2550R more suitable for large workpieces and machining operations where stable torque output is needed.

Another practical point is the combination of linear guideways on X/Y and a box way on Z. The machine therefore does not use the same guideway structure on all three axes. The Z-axis arrangement is specifically intended to maintain support when the 400 × 400 mm ram extends during machining.

The machine can also be supplied with additional machining equipment such as automatic universal milling heads, extension milling heads, right-angle milling heads, a 180T vertical/horizontal tool magazine, 3 MPa spindle-center coolant, Renishaw laser interferometer and probe, and a wireless electronic handwheel.

The GFA-2550R is intended for large mechanical components that require several machining operations on the same machine.

Typical applications include:

• Construction & General Machinery - large bases, frames, structural parts and mechanical components
• Automotive Manufacturing - large tooling and structural components
• Power & Energy Equipment - equipment bases, housings and large fabricated components
• Mold Manufacturing - large mold bases and mold structures
• Civil Aviation - large structural components
• Shipbuilding - marine structural and mechanical components
• Rail Transportation - long structural parts and large mechanical components

The technical agreement specifically lists general machinery and construction machinery, automotive manufacturing, power and energy equipment, mold processing, civil aviation, shipbuilding and rail transportation among the intended application fields.

The GFA-2550R can be configured according to the workpiece, machining process and workshop layout. The documented selectable configurations include:

• Automatic universal milling head - with head magazine and center coolant
• Automatic extension milling head - with center coolant
• Automatic right-angle milling head - with center coolant
• ZF gearbox - 1/5.5 ratio, supporting center coolant
• 3 MPa spindle center coolant
• Renishaw laser interferometer + probe
• 180T vertical/horizontal tool magazine
• 15.6-inch operation screen
• Wireless electronic handwheel
• 2500 mm Z-axis travel
• Standard or sunken foundation

These options can be selected according to the customer's machining process and installation conditions. Other configurations can also be discussed with the manufacturer and added to the technical agreement where required.

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