Services

Keystone Rolls, Inc. employs the most technologically advanced hard chrome plating system available in the industry today. This system has been designed specifically for our needs and your requirements. Plating bath solutions are constantly analyzed in our laboratory to ensure exact plating chemistry. The actual plating cycle is controlled and monitored by a centrally located electronic operator station, where all critical plating variables such as temperature, amperage and voltage are maintained. This consistent control of solution chemistry and operating procedures yields a high-quality plating deposit that is required for our final finishing operation. In addition to providing the highest quality plating deposits, our self-containing plating system is designed to ensure a clean, safe environment by utilizing only the most advanced scrubbers and ventilation systems, all in full compliance with EPA standards.

Machining and Fabrication
capacity 36" diameter x 300" overall length

Every roll manufactured or reconditioned by Keystone Rolls is made exactly to specification. Whether it is our design or yours, we take no shortcuts. You receive a quality roll -- just as you ordered it. Every component is precision machined and assembled. For example, once our double shell chill roll's internal construction is completed, we shrink fit the outer shell to the inner assembly and automatically weld the assembly. All weld joints are hydrostatically pressure tested to ensure leak-free performance. These factors give you greater load strength for higher P.L.I. load applications. Furthermore, every part is thoroughly inspected and documented before it is shipped to provide our customer predictable quality every time.

Sub-arc Welding for Size Restoration or Hard Facing - 36" diameter x 240" overall length

We machine the outer roll shell undersize for 420 stainless steel hard surfacing of new rolls. The roll shell is then set up in a submerged arc automatic welder and welded with two passes of 420 stainless steel with a residual thickness of 1/8" per side. Our 420 S.S. shell provides a uniform hardness of 50-52 Rockwell C across the entire roll surface. We can also take your existing soft shell roll and convert the outer shell to 420 S.S. "hard-shell" or remove the existing outer shell, reconstruct internals, and replace it with a new hard surfaced 420 S.S. "hard-shell." A variety of other metals as well as 420 stainless steel can be used to restore diametric size easily and affordably.

Grinding
36" diameter x 300" overall length

Whether you demand straight or true parabolic crowning, our grinders can predictably do the job. In new hard chromed chill roll applications, the finished machine roll assembly is ground in final preparation for hard chrome plating. After plating, the roll assembly is given another grind for the final T.I.R. (Total Indicator Runout). At this stage, roll roundness and straightness is established, as well as diametrical size. Final bearing dimensions and lengths are also established at the final grind operation. Have a roll that is need of repair? Our grinding services are available around the clock to ensure fast accurate results.

Finishing and Surface Measurement: