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editorial E


Another Point for Casting Conversion


Casting Con ersion


components originally produced with another manufacturing method that are redesigned for the metalcasting process. Typically, the cases involved a multiple part weldment or fabrication re- engineered as a single-piece casting. T e casting process off ers many benefi ts to the designer that centers around the freedom of


I ‘‘


As someone who is a customer of foundries, you have the power to encourage your casting sources to further explore 3-D printing.”


shape, making it a good choice for intriate parts. T e designer can manipulate a component to meet multiple functions, place material and strength where needed, and remove material where it is not for lower weight and cost. Still, metalcasting is not always the fi rst


manufacturing method considered for a new part and it might not be until after production and some time has passed that the case for metalcasting starts to surface. Cost reductions might be sought, or better repeatability is needed. Metalcasters can be pretty good at spotting potential conversions to metalcasting and often work with customers to do a cost benefi t analysis, pinpointing which pieces would decrease costs and improve value the most. Even after considering the benefi ts to


converting to metalcasting, designers and purchasers have another hurdle: tooling cost. Investing up front on the patterns to make the castings for a component already in production? It is not an easy pill to swallow, and traditional tooling can be expensive. However, metalcasters are making inroads in


6 | METAL CASTING DESIGN & PURCHASING | Nov/Dec 2017


n Metal Casting Design & Purchasing, we share many stories and examples of casting conversions. T ese are engineered


reducing those manufacturing


educing those costs. Rapid


manufacturing has been building


steam and


includes CNC patterns, 3-D


includes CNC machining


patterns, 3-D printing sand and


wax molds, and now, 3-D printing plastic patterns. T is past year I have visited three metalcasting


facilities that print their own patterns in-house, and they report it has been game-changing. T e article, “Jump-Start Tooling With 3-D Printing” on page 22 explores the opportunity this technology has for metalcasting and the designers who can take advantage of the process with lower tooling and development costs. In recent years, 3-D printing equipment and


material has become more widespread and less expensive, so the barrier to entry is lowering. Printing patterns is quicker and cheaper than producing them the traditional way, particularly when going through the design and development phases. Often this method is used for very low volumes, such as between one or two pieces, but that is changing. One foundry I visited this summer is using its 3-D printed patterns in its automated green sand machine for up to 500 molds. As someone who is a customer of foundries,


you have the power to encourage your casting sources to further explore 3-D printing their tooling. It can lower your costs and time to market, as well as remove a little bit of the hurdle for redeveloping a part to take advantage of the casting process’ design freedoms.


Shannon Wetzel, Managing Editor


If you have any comments about this editorial or any other item that appears in Metal Casting Design & Purchasing, email me at swetzel@afsinc.org.


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