An Oak Ridge company has started work on an expansion of its facility that could create up to 20 new jobs over the next three years. Tennessee Tool & Engineering is expanding its facility in the Bethel Valley Industrial Park by some 10,000 square feet in order to meet a growing demand for its products. The 45-year-old company is expanding its High Pressure Die Casting division and plans to invest $5 million in the project, which will allow the company to install three more 700-ton cast presses and machining equipment. An expansion of the company’s Emory Valley Road location is also slated for 2018. TTE, as the company is known, makes high-pressure die-cast aluminum components for the automotive and ATV industries. TTE currently employs over 160 people.