TPT November 2015

Technology News

Double end finishing machine for bent aerospace elbows

the finish length for each leg of the elbow. With repeatability achieved, a program had to be developed that would accommodate dozens of diameter and length combinations. Haven’s system engineers custom designed a user- friendly program and operator interface for entering part parameter data. To make a changeover, the operator simply chooses the part number from a menu to change the program. On the mechanical side of the machine design, the work piece fixtures were machined to the shape of the part. This machine replaces a manual operation that had difficulty maintaining dimensional consistency. Haven’s solution not only improved productivity and quality, but also resulted in a more capable downstream assembly process.

HAVEN is an expert in double end finishing equipment for applications ranging from simple chamfering to extremely tight tolerance specifications, such as automotive shock absorbers. These standard applications have a common feature: the work piece is straight. However, this was not the case for an aerospace supplier that required an automatic machine to perform chamfering and end facing on both ends of a bent tube elbow. The challenge posed to Haven was to design a machine that would end finish both ends of a bent tube, in one setup. In addition, the machine had to be programmable to automatically adjust feeds and speeds for infinite tube diameters and lengths, and not all parts are symmetrical. A traditional dual spindle arrangement would not be practical. Haven engineers had to devise a way to precisely rotate the part from one end to the other and

Haven’s special double end finishing machine for bent elbows

accurately machine both ends without enduring a lengthy setup process. The solution was to use a servo- controlled index turntable and a servo- controlled precision bearing spindle. The accuracy of these devices was needed to position the part to an exact location and then feed the cutting tool to the proper depth, which established

Haven Manufacturing – USA Fax: +1 912 264 9001 Website: www.havencut.com

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N ovember 2015