How Automatic Rivet Nut Guns Are Applied in Sheet Metal Processing: Process Coordination Points - CHANRUI

Sheet metal processing ranks among the fields with the largest pull rivet nut usage. Thin-plate parts such as cabinets, door panels, mounting plates and home appliance shells later rely on screws to assemble door hinges, guide rails, shelves and accessories, so durable internal threads must be formed on 1-3mm plates. Automatic rivet nut guns were created to solve exactly this problem; this article explains where they sit in the sheet metal process and what the coordination points are.

I. Three pain points in sheet metal threaded connections

Weak thin-plate tapping:When the plate is too thin, there are only two or three thread teeth, and the screw strips with slight force and cannot be repeatedly assembled/disassembled;Welded-nut defects:Spot-welded nuts carry the risks of thermal deformation, weld spatter, false welding and burn-through, and also damage the finished surface treatment;Inaccessible backside:Hands cannot reach inside boxes, square tubes and closed cavities to place a nut or bucking bar. Pull rivet nuts deliver single-side construction, cold-deformation forming and post-painting assembly, solving all three problems at once.

II. Typical sheet metal workpieces

III. Sheet-metal process coordination points

Pull rivet nut quality is already decided at the sheet-metal blanking stage: first,pre-drilled holes, with the hole diameter machined per the nut specification table - round holes for cylindrical nuts, hexagonal holes for hexagonal nuts; too large means loose, too small means it will not insert; second,hole edge distance and hole spacing, leaving forming space away from bend edges and plate edges so the bulge does not push the edge; third,bend tolerance, the mating faces of two stacked pieces should be flush, since excessive gap under forced riveting causes looseness; fourth,surface treatment sequence, paint/powder-coat first and add rivet nuts afterward as much as possible, to keep coating from clogging the threaded holes, and choose countersunk nuts on appearance surfaces to stay flush.

IV. From manual to automatic: the upgrade path for sheet-metal workshops

Multi-variety small-batch sheet-metal shops find pneumatic semi-automatic rivet nut guns flexible and low in investment; for products with fixed points and large batches such as door panels and mounting plates, once auto-feed rivet nut guns are added workers are freed from nut picking, screwing and reversing actions, with clearly improved cycle and consistency; dedicated lines such as server cabinets and automotive parts can further move to fixed or robot cells. Chassis/cabinet and power cabinet companies can refer to the automotive industry upgrade caseNew Energy Automotive Parts Riveting Case; the equipment type comparison is inHandheld, Fixed, Dual-Gun and Robot Cell Comparison。

Sheet-Metal Application FAQ

V. Four steps to automate a sheet metal workshop

Step one, statistics: list the nut specifications, points per piece, monthly output and current riveting-station headcount for all products, and find the product with the most points and largest batch; step two, trial: have the manufacturer bring automatic rivet nut guns to sample on-site with real sheet metal parts, recording single-rivet time, per-piece work time, thread pass rate and worker feedback; step three, pilot: place one device on a dedicated door panel or mounting plate line first, run a full month of orders, and calculate the real changes in labor and defects; step four, rollout: copy the verified cycle and fixture solutions to similar stations, and fix the nut specifications and hole-diameter standards into the sheet metal process card to ensure consistency from the blanking stage. Chassis/cabinet and power cabinet companies can refer toSheet Metal and Stainless Steel Processing Automation Efficiency Improvement。

Recommended reading:Pull Rivet Nut Types and Selection Comparison · Through-hole and Blind-hole Processing Requirements · Automatic Rivet Nut Gun