CX® Roller Burnishing Eliminates Costly Inspections and Rejections
External burnishing machine eliminates surface imperfections; provides ideal seal surface for O-rings
MANUFACTURER OF IRRIGATION PUMPS AND SPRINKLERS was having problems producing sprinkler shafts. The manufacture of the shafts was outsourced for turning, centerless grinding, and heat-treating. Upon delivery the parts had to be 100% inspected for nicks or scratches, since rubber O-rings were riding on the on the surface. The time-consuming and costly inspection process resulted in a 35-40% rejection rate. They asked Cogsdill for assistance. Cogsdill ran the parts on a CX-1T external roller burnishing machine. The machine features an interference-style sub-assembly for through-feeding parts. (See reverse side for a guide to CX Machine sub-assembly options.) The required part tolerance was held as the customer achieved a surface finish "never seen before!" Imperfections were eliminated, thereby creating a much better part surface for the O-rings to ride on.
Now after receiving the parts, they are simply run in one fast pass through the CX-1T machine. The costly and time-consuming inspection, and the rejections, are eliminated. The satisfied customer, currently burnishing two parts of different diameters, is considering the purchase of another machine for a third part diameter. Cylindrical parts of any length are accurate sized with a fine finish and a work-hardened, wear-resistant surface... in seconds.
Machining Data
Machine type: CX-1T-A
Component: Water sprinkler shaft
Material: 303 stainless steel; 17PH stainless steel
Spindle speed: 2000 RPM
Feed rate: .075 IPR (1.9 mm/rev)
Cycle time: 1 second
Coolant: Water soluble
Sizes required: .1212 + .0002 in. (3.078 + 0.005 mm) .0753 + .0002 in. (1.912 + 0.005 mm)
Sizes achieved: .1211 in. (3.075 mm) .0752 in. (1.910 mm)
Finish required: 12 microinch Ra or better (tear-free; no scratches or nicks)
Finishes achieved: 3 microinch Ra (0.075 micrometer) 2.2 microinch Ra (0.055 micrometer)
A guide to CX Machine sub-assembly options:
The interference-style unit sizes parts to exacting tolerances as it imparts a mirror like surface finish. (The working diameter of the CX race assembly is set to be slightly smaller than the O.D. of the part, hence the term "interference.")
As an alternative, the air-pressure controlled compensating unit allows the machine to adjust automatically to different part diameters. These models are used in applications where finish, rather than size, is the primary (or only) requirement.
Either style is available for through-feed of parts, or with an adjustable stop-andrelease mechanism for burnishing parts up to shoulders or obstructions.
Cogsdill Tool Products offers a wide array of standard tooling and a broad range of solutions for burnishing including: Standard Roll-a-Finish tools for IDs and ODs; Special designs for tapers, faces and contours; Single-roll and diamond tools for ODs, large IDs, faces, tapers, contours, and irregular surfaces; CX external burnishing machines for shafts or cylindrical surfaces of any length. Parts are sized, finished, and work-hardened in seconds! Refer to our catalog no. 500, Burnishing Tools and Machines, for more information.
In 1914 Stuart A. Cogsdill set up shop in Detroit as a cutting tool regrinding and repair service. He soon began designing and manufacturing special tools for early automotive pioneers such as Henry Ford and the Dodge brothers. Today Cogsdill Tool still offers its 21st century customers the same commitment that inspired its founder: We will develop and build innovative tooling solutions for your tough manufacturing problems. Cogsdill has two operating units, one in the United
States and one in the United Kingdom.
Contacts:
Public Relations:
Fred Ogburn Corporate Communications Manager, USA
(803)438-4000 ext 218 fogburn@cogsdill.com
