Abstract: A method and apparatus for coldworking of holes using a split mandrel. The apparatus uses a mandrel having radially directed slots to permit contraction of its outer diameter as it is fitted within a hole. The mandrel contains a pilot inside the mandrel. After placing the mandrel and pilot within a hole to be coldworked, the pilot is pushed into the mandrel expanding the mandrel. The pilot and mandrel are then withdrawn through the hole, thereby coldworking the hole.

Abstract: A method and apparatus for coldworking of holes using a split mandrel. The apparatus uses a mandrel having radially directed slots to permit contraction of its outer diameter as it is fitted within a hole. The mandrel contains a pilot having a larger diameter extending from the mandrel. After placing the mandrel and pilot within a hole to be coldworked, the pilot is pulled into the mandrel solidifying the mandrel. The pilot and mandrel are then withdrawn through the hole, thereby coldworking the hole.

Abstract: A method and apparatus for coldworking of holes using a split mandrel. The apparatus uses a mandrel having a larger diameter end and radially directed slots to permit contraction of its outer diameter as it is fitted within a hole. The mandrel partially contains a pilot in its "at rest" state. After placing the mandrel and pilot within a hole to be coldworked, the pilot is pushed fully into the mandrel solidifying the mandrel. The pilot and mandrel are then withdrawn through the hole, thereby coldworking the hole. An air logic circuit accomplishes the pushing of the pilot within the mandrel and retraction of the pilot and mandrel.