Intech Power-Core Thermoplastics Engineering Blog

Actuator Redesign For High-Speed Belvac 795 Can Making Machine

Posted by Alexander Bartosch on Feb 25, 2013 12:01:00 PM

Though the necker on a can making line performs a very specialized task, the mechanical subsystems found on this machine offers a number of design lessons that can be applied more broadly by any engineer working to improve the performance and reliability of high-speed equipment.

Consider, for example, the necker’s cam-driven ram actuators. Mounted on a rotating turret and moving at speeds up to 250 strokes per minute, these rams push the round can shell onto a series of shaping dies that gradually reduce the diameter of the can to form its neck.

Traditionally, these Belvac rams have consisted of a round moving pin that translates axially within a barrel-like steel housing, with a machined keyway to keep the pin from rotating. The ram was driven directly via a pair of metal cam followers that mount on the rear end of the pin and engage a stationary cam.

That design, however, suffered from three problems in the field. For one, it required an aggressive lubrication regimen to combat ram and cam wear. For another, it allowed the pin to lift and twist in the barrel, causing premature wear that extends all the way back to the can. And lastly, the traditional design limited the operating speed of the necker.

We eliminated all three problems with a radical redesign of the ram that:

  • Eliminated the need for lubrication. The redesign replaced lubrication-hungry metals with lube-free polymers wherever possible. The redesign completely does away with the metal-on-metal wear between the cam and cam followers, which had been the primary failure mode with the traditional ram design.

  • Optimized the geometry of the ram. The redesign features a square ram, rather than round. The square ram does a far better job at managing the actuator’s on- and off-axis forces. It also guides the pin more effectively, reducing wear.

  • Removed moving mass. Thanks to the use of polymer components and structural aluminum, the redesigned ram weighs in at less than half the weight of the traditional round ram design. Total reduction of moving mass on a 10-stage line is nearly one metric ton.

Now in use by can makers around the world, the redesigned ram has offered a compelling payback. It has resulted in reduced maintenance costs, including the elimination of expensive automated lubrication systems. It has also contributed to reduced defect rates and faster line speeds.

Learn more about the redesign in our latest design case study, Redesign Improves High-Speed Can Making Machine. The case study offers a deeper look at our design process, including a glimpse at the finite element analysis (FEA) work that guided some of our decisions. The case study also highlights the side-benefits of designing for lubrication elimination.

 

Download the design case study

Tags: Belvac 595, cam follower, cam followers, reduce noise, reduce shock, reduce vibration, Self-lubricating, non-lubricated, cams, PA12GC, iCamFollowers, Cast Nylon, can making, low inertia, high load capacity, friction-reducing coating, production line shut-down, Belvac necker, Belvac 795, Belvac super k

Cam Followers for RT Light Testers in Can Making Production Line

Posted by Simon Barrell on Aug 27, 2010 11:26:00 AM

In a high speed can making production line, light inspection is required to find pin holes and split flanges after the necking process. Once cans have been coated and sealed, these finished cans are tested for leaks using a light tester, which can detect holes 0.002” wide, smaller than a human hair, and also spot cracked flanges as small as 0.015”.

When Intech iCamFollowers® are installed on the light tester ram they ensure that 3,000+ inspections can be performed per minute, more than sufficient to keep up with the high speed can production line and offer several important benefits.

After installation, the lubrication lines originally used to grease the metal cam followers can be disconnected, cutting down on periodic maintenance and possible contamination of the can. Another important benefit is the fact that the cam propelling the ram back and forth is now protected from wear by the IPC tire.

Fitted with precision ball bearings the Intech iCamFollowers® are easy rolling and the plastic tire does absorb shock and vibration for overall smoother performance.

The Intech iCamFollowers® have also been running successfully for many years in the necking operation on Belvac neckers, both on rams made by Intech, the light weight, self-lubricating square ram, as well as on the original Belvac rams.Light tester and cam followers

Tags: cam follower, cam followers, Self-lubricating, shock load, vibration, can making, icamfollower, light tester, necking operation