Solutions Through Welding Technology...

NBC-9621 Motor Frame/Shell
Manual Processing 

Application:

Manual production of fractional horsepower steel motor frames or other cylindrical shells , starting with flat steel sheets or blanks, forming to predetermined diameters and lengths and then seam welding.

Production:

Dependent on material thickness and shell length. Housings 6.00" (150 mm) long of .060" (1.5 mm) thickness, are produced at a rate of 200 per hour.

Cost Savings:

These machines are designed to minimize cost by using operators instead of automation for low volume production.

ROLL FORMER This 3-roll former automatically is fed blanks, one at a time, from a bottom feeding magazine.

Capacities:

Note: These machines, are essentially single purpose units, specific capacity of each machine within specified ranges requires factory consultation.

SEQUENCE of MANUAL OPERATION

1. Feeding blanks automatically one at a time from a bottom feeding magazine into 3-roll forming machine, producing a cylindrical shape.
2. Formed shells are placed on weld mandrel. Shell edges are aligned automatically, overlapping them under controlled conditions and clamping on weld mandrel. Welding is by a pressurized, traveling upper weld roll head, with the shell automatically stripped from mandrel.
3. Welded shell is then placed on the nipper, both ends are nipped at the same time.
4. For the final operation the shell is placed on the expander mandrel and expanded for final sizing.

WELDER This motor shell welder produces shells at a rate of 200 per hour.

Standard Design Features:

Manual Machines
Operator loads and unloads each machine either in sequence or there are separate operators for each machine.

Positive Clamping System
Through three sequentially actuated clamps which maintain cylindrical consistency - one for gauging, one for wraparound and one for final overlap fix.

Removable Welding Mandrel Nose-Piece
Consists of a water-cooled core with laminated phenolic plastic or cast copper with hardened tool steel wear inserts on the OD with replaceable welding insert.

Automatic Edge Alignment
Pusher mounted on each clamp at weld station locates all errors due to nonparallel blanks to one end of the shell.

Trouble-Free Weld-Head Bearing
Special Newcor patented anti-friction bearing assembly for pressure application with spring-loaded, laminated silver contact.

Rigid Mandrel Support
Through an air-operated outboard support to eliminate mandrel deflection during clamping and welding cycles.

Variable Welding Speeds
Weld head stroke, air-hydraulic actuated and adjustable up to 300 inches per minute (7.5 meters / minute).

DUAL EXPANDER DUAL EXPANDER This expanding head mounted horizontally reduces the contamination of the hardened and ground expander segments from material flaking off the shell during expanding.

Auxiliary Equipment:

Automatic Shell Ejection
By an arrangement that permits welded shells to be stripped from mandrel as new shell moves in place.

Auxiliary Equipment
To meet stringent quality or size factors in volume processing of cylindrical shapes, above equipment can be provided completely automated, including.

1. Cooling conveyor or transfer between welding station and subsequent processing steps.
2. Duckbill Transfer-which removes shell from welder ejection point, rotates it for orientation and deposits it on shuttle transfer.
3. Multiple-station shuttle transfer, electrically operated, with air clamps to carry shells in vertical position for planishing and expanding.
4. Vertical planishing to flatten weld beads to within 10% buildup of parent metal thickness.
5. Vertical expanding to modify shape or achieve close control of final size.
6. Automatic Nipping - to eliminate extrusions at ends of welded joint.
7. Automatic quality control - through air-jet gauging unit which makes 100% check of average ID of shells.
8. Automatic machining of both shell ends including chamfering and facing, maintaining parallelism, runout and lengths to specified tolerances.

NIPPER NIPPER This standard design nipper, nips both ends of shell at same time.