years of experience in the tool- ing casting industry and extensive work with many casting facilities, took the lead and sent out a more detailed RFQ. HAB selected Acme Castings, Huntington Park, Calif., to produce the part based on an agreement that HAB would supply the stereolithog- raphy (SLA) patterns, rigging and design and take total responsibility for the fi nished casting, paying for it regardless of meeting all requirements.
From Order to Completion
The defl ector tray casting had diffi cult thin-to-thick sections where walls transitioned from 0.08-in. to 1.5 x 1.75-in. mounting areas.
were diffi cult (0.08-in. walls to 1.5-in. x 1.75-in. mounting areas).
• T e casting was too rangy to readily be straightened.
• Grade B and C X-ray require- ments were too diffi cult for the
casting confi guration. After careful consideration by
the team, it was determined the deflector tray still was a viable cast- ing design, and TDP requirements could be produced. HAB, with 85
Benet issued a purchase order and the manufacturing process was started. Heat treatment of rangy parts is prone to cause distortion. The first process was to develop a means to achieve the dimensional requirements. HAB added tie bars, which would be cut off prior to straightening, to the casting model to minimize the distortion during the quench. T e next issue involved
28 | METAL CASTING DESIGN & PURCHASING | Jul/Aug 2013
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