T&H Lemont ships two heavy-duty weldboxes

T&H Lemont recently shipped two identical heavy-duty three-roll weldboxes to a mechanical tubing manufacturer involved in markets such as automotive, off-road vehicle, agricultural equipment, conveyor equipment, and other demanding applications. The company makes tubing in sizes up to 3 in. OD and up to 10-gauge wall thickness.

These custom-designed weldboxes, model WU-25, are replacements for a competing manufacturer’s 15-inch chuck-style weldboxes. T&H Lemont’s engineering team used a proprietary design and modified it to match the mill’s bottom line. The engineering team also designed the clevises to utilize the customer’s original tooling to minimize the cost of this upgrade.

Designed for quick changes, the units have removable face plates so the operator can swap out the three clevises and tooling quickly. The operator loosens four C washers and swings them out of the way, then uses the unit’s lifting hooks to remove the face plate, then installs the next face plate just as easily.

The four C washers, one at each corner of the faceplate, are the key elements in making quick changeovers.

For ease of setup, the new units are gib-mounted and have three positioning adjustments—vertical, lateral, and upstream/downstream. Additionally, each roll clevis is equipped with a single-point adjustment that has a dial indicator to help the operator adjust the rolls precisely during every changeover. 

The dial indicators, one for each clevis, assist in precision setups.

The units likewise are designed for ease of maintenance, outfitted with zerk fittings at all the critical lubrication points. An operator-side manifold allows the operator to grease the roll shafts, which require grease more frequently than the other points, while the mill is running.

The grease fitting manifold, at left, allows the operator to grease the roll shafts without reaching over the weldbox.

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