LSR Riveting Systems

Machine Dynamics LLC has developed a unique automated fastening system, totally eliminating the need for hydraulics in the riveting process. Using roller screw technology coupled with a true position motion control system, this riveting system provides unique solutions to problems in automated fastening. Capable of installing solid rivets (universal and flush), nut plates, two piece and blind fasteners with the same machine. The simplicity of the system allows an operator with little riveting knowledge to operate the LSR system. The all-electric system offers simplicity in design, unmatched performance, longevity, and elimination of virtually all maintenance.

Cartridge System:

The operating principle of the cartridge system uses a roller screw mounted inside a chrome plated, precision ground tube or force tube. The roller screws' radial thrust bearings are fixed in a upper bearing housing that is attached to the head casting. The roller screw nut is attached to the force tube and as the roller screw rotates, the force tube periscopes up and down in the head. This robust head configuration gives the smoothness and precision required in the riveting process.

Head Housing:

The head housing is a special one piece steel casting that contains one or more drilling cartridges and the upper ram. All surfaces of the casting are completely machined and precision bored to accept a Luytex (polyester resin bonded synthetic composite) bearing. The Luytex bearing is pressed into the casting and honed to exact tolerances. This insures permanent alignment between drill spindle cartridge(s) and the upper ram cartridge.

Spindle Cartridge:

The spindle cartridge uses the same force tube configuration except the roller screw is bored hollow to accept the drill spindle assembly. The drill spindle rotates independently inside the roller screw. The drill spindle shaft has an external spline that is inserted into a internal splined shaft. This shaft is captured inside the roller screw by a set of bearings to prohibit any linear movement. During the drilling cycle the splined shaft transmits power to the drill spindle. The spindle motor is stationary during the drilling cycle.

The spindle housing is located at the end of the force tube. This spindle housing contains a set of super precision triplex nose bearings, a spacer, followed by another set of duplex nose bearings. Seals in the nose and tail ensure contaminates cannot enter the spindle assembly.

Upper and Lower Ram Cartridge:

The upper/lower ram cartridges use the same force tube technology as the spindle cartridge. The nose of the force tube is piloted to accept various adapters to hold any configuration of upper anvil tooling and lower tooling including the clamp table. Both cartridges are interchangeable.

C-Frame:

This superstructure is the backbone of the riveter. The C-frame supports the upper head assembly and the lower ram assembly and comes in all sizes to accommodate the configurations required by the customer.