Abrasive flow machining (AFM) is an industrial process that uses a specialized polymer with added abrasives to smooth and polish the internal surfaces of metal objects. AFM equipment can be single or dual flow, with the latter delivering a more even and smoother result. AFM is commonly used in finishing parts that require smooth internal finishes and controlled radii, such as automotive engine blocks. The process is cost-effective, almost fully automated, and can handle several thousand parts per day. Hydroerosive Grinding (HEG) is a specialized form of AFM used to achieve an even radius in metal parts.
Abrasive flow machining (AFM), also known as extrusion honing, is an industrial process used in metalworking. This process is used to finish the internal surfaces of molten metals and produce controlled radii in the finished product. The abrasive flow machining process produces a smooth, high-gloss finish using a pressurized medium.
The medium used in abrasive flow machining is a specialized polymer. Abrasives are added to the polymer, giving it the ability to smooth and polish the metal while retaining its liquid properties. The liquid properties of the polymer allow it to flow around and through the metal object, conforming to the size and shape of the passages and details of the molten metal.
Abrasive stream processing equipment is made in single and dual stream systems. In a single-flow system, the abrasive medium is forced through the project at one entry point and then out the other side, leaving a shiny interior to mark its passage. For a more aggressive polish, the dual-flow abrasive stream machining system could be employed.
In dual flow systems, the flow of the abrasive medium is controlled by two hydraulic cylinders. These cylinders alternate motions, pushing and pulling media across the project. This delivers a more even and smoother end result in much less time than a single stream system.
The abrasive flow machining process is used in finishing parts that require smooth internal finishes and controlled radii. Examples of these parts include automotive engine blocks and other precision finished parts. The process is also used in the metal fabrication and casting industries to deburr molds and remove remelt layers from molds used during production.
Abrasive flow machining allows you to polish and smooth areas that would otherwise be inaccessible, as the ability of the fluid to flow through the workpiece is the only limiting factor. Additionally, the abrasive stream machining process can be almost fully automated, allowing human operators to perform other tasks and providing a cost-effective solution for part finishing. The equipment used in this process can handle several thousand parts per day and can still deliver consistent results. These capabilities have made abrasive flow machining a common factor in part finishing operations in many industries.
Hydroerosive Grinding (HEG) is a specialized form of abrasive flow machining. It is used to force abrasive media through orifices and the intersection of holes in metal parts to achieve an even radius. This technique allows for the calibration of static flow rates in equipment.
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