WHY CHOOSE INVESTMENT CASTINGS?
Investment castings have significant advantages over other manufacturing technologies as summarized in the Manufacturing Process Comparison Chart at the bottom of this page. In general, investment castings demand the fewest design restrictions of any metal-working process. The more demanding the part configuration is, the more advantageous the investment casting process is.
A summary of the unique benefits of the investment casting process follows:
Design Freedom: The investment casting process allows the designer the flexibility of nearly infinite alloy choices, and great flexibility in external and internal configurations. In addition, unlike other casting methods, there are no draft requirements in the investment casting process.
Reduced Machining: Investment castings are produced to close tolerances and near-net size. There is little secondary machining required, thus offering savings in machining time and material costs. Even some splines and threads can be cast.
Reduced Fabrication: Thin and thick sections can be cast as one piece, and weldments can be replaced with single piece castings.
Good Mechanical Properties: Investment castings have mechanical properties that are better than any other casting technology.
Superior Aesthetics: Curved and shaped surfaces are easy to produce, integrally cast marking and logos are possible and the surface finish of investment castings is consistently better than 125 RMS..
Reproducibility: The investment casting process produces a reliable and consistent product. At American Casting Company, our ISO 9001:2000 based process control system yields remarkable consistency from part to part as well as from batch to batch. This reproducibility feature means our customers will save time in both machine set up and assembly.
MANUFACTURING PROCESS COMPARISON CHART
| Manufacturing Process | Investment Casting | Weld Assembly | Machined Hog Out | Forging | Powder Metal | Sand Casting | Die Casting |
| Complexity Of Part Shape | Best | Average | Average | Simple Only | Simple Only | Above Average | Average |
| Part Integrity | Above Average | Above Average | Best | Best | Poor | Average | Poor |
| Mechanical Properties | Better | Best | Best | Best | Poor | Better | Poor |
| Alloy Choices | Best | Better | Better | Best | Average | Best | Worst |
| Minimum Section Thickness (In.) | 0.04" | 0.03" | 0.05" | 0.08" | 0.03" | 0.1" | 0.03" |
| Surface Finish | Above Average | Above Average | Best | Better | Better | Average | Better |
| Tolerances | Average | Average | Best | Poor | Better | Poor | Better |
| Part Size | Tiny to Medium | Any | Any | Tiny To Large | Tiny Only | Any | Tiny to Small |