D28 Welding Table CNC Machined Precision Hole Pattern
The D28 Welding Table with CNC-machined precision hole pattern is a heavy-duty, flexible welding fixture platform specifically designed for welding engineering machinery components. Its core feature is the high-precision array of Φ28mm standard holes achieved through CNC machining. Combining high rigidity, high precision, modularity, and rapid clamping capabilities, it is a core piece of equipment for welding, assembly, and inspection of engineering machinery structural components (such as booms, frames, cranes, and outriggers).
| Hole Diameter |
Φ28mm, H7 tolerance (+0.021/0) |
Hole Spacing |
100×100mm (standard grid), ±0.03mm (heavy-duty version ±0.02mm) |
| Hole Depth |
Standard ≥30mm (customizable), depth tolerance ±0.05mm |
| Hole Position Flatness |
0.08mm/1000mm, calibrated with a marble straight edge |
| Surface Roughness |
Ra3.2μm, precision grinding + nitriding / powder coating |
CNC Machining Core Processes
- Raw Material Pre-treatment: Q355/QT600-3 ductile iron / thick steel plate, stress relief annealing (to eliminate welding/casting internal stress and prevent deformation after machining).
- CNC Rough Machining: Gantry machining center rough milling of the table surface, drilling of pre-holes, leaving a 0.3-0.5mm finishing allowance.
- Aging Treatment: Secondary aging treatment after rough machining to further stabilize dimensions.
- CNC Fine Machining:
One-time clamping completes precision grinding of the table surface + precision boring of the hole system + grid line engraving, avoiding errors from secondary clamping.
High-precision spindle (speed ≥8000rpm) + carbide boring tool are used to ensure consistency of hole diameter/pitch.
3D simultaneous machining of side/end face hole systems to achieve three-dimensional spatial positioning.
- Inspection and Calibration: Coordinate Measuring Machine (CMM) performs full inspection of hole position accuracy, flatness, and perpendicularity, and issues an inspection report; non-conforming products are reworked/scrapped.
- Surface Treatment: Electrostatic powder coating (C3) / QPQ nitriding (HV600, C4) / nitriding + hot-dip galvanizing (C5M, for coastal/desert environments), for rust prevention and wear resistance.
Flexible procurement strategies
- Standard Purchase: Single or multiple units available from stock. Payment in full required before shipment. Standard models are readily available in sufficient stock and can be shipped within 7 days.
- Customized Purchase: Customized according to customer's required table size, thickness, precision, and surface treatment. Production begins with a 30% deposit, with the remaining balance due before container loading. Video inspection is supported, and shipment will be arranged after confirmation of quality.
- Bulk Purchase: Tiered discounts available for orders of 5 units or more (5 units - 8%, 10 units - 15%, 20 units or more - 20%). Credit terms (30-60 days) are also available for long-term large customers.
- Sample Purchase: Small-sized sample tables (e.g., 1000×2000mm) are available for purchase. 300% prepayment is required, and delivery will be within 15-25 days, allowing customers to test precision and compatibility.
Contact Us
Precision in every hole, excellence in every weld.
With CNC precision machining at our core, we specialize in R&D and manufacturing of D28 welding tables. Adhering to millimeter-level precision and industrial-grade rigidity, we ensure every hole array is perfectly aligned and every welding table is built for heavy-duty intelligent manufacturing.
From construction machinery to general heavy industry, we lay a solid foundation for welding processes with cutting-edge technology and empower global manufacturing with precision equipment. We join hands with industry partners to forge a high-quality industrial future through superior welding.
