Caterpillar Inc.

Mark Wayne Hammerton

Murray R Mason

Rajesh Mishra

Thomas Allan Jenne

Dale Higdon

Sean Alan Randleman

Daniel Kurtis Allen

Scott A Christianson

Ahti J Isolehto

Timothy J Linder

A method of forming a hole in a hollow blank during a hydroforming process is provided. The method includes placing a blank in a cavity of a hydroforming die, the hydroforming die being configured to permit a punch to engage the blank. An interior of the blank is pressurized with a fluid. Further, a cutting end of a punch is applied through a wall portion of the blank and into the interior of the blank to form a hole. Furthermore, the cutting end of the punch is removed from the interior of the blank such that the cutting end of the punch is configured to allow material of the blank surrounding the formed hole to move away from the interior of the blank.

System and method of forming hole in blank during hydroforming process

A stamped roof panel for the cab of a utility vehicle includes a base portion having a periphery, a protrusion extending upwardly around the periphery of the base portion, and a plurality of drainage gaps in the protrusion. The protrusion has a generally U-shaped cross-sectional profile with a first leg extending from the base portion, a bight portion, and a second leg extending downwardly from the bight portion. The second leg of the protrusion may extend downwardly beyond the base portion and the top edge of the wall panels of the cab. The roof panel may further include a raised panel spaced upwardly from the base portion.

Stamped roof panel for a utility vehicle cab

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Peoria, IL, United States of America

Mark Wayne Hammerton