Advancements in Single-Pass Bore Finishing - Process

The singlepass bore finishing Processo involves a series of preset diamond coated tools that get passed through a bore with a single inandout stroke movement while the tool, part, or both are rotating. The number of tools that are used will vary depending upon the amount of stock to be removed, surface finish requirement, geometrical requirements, and material make up. Generally each tool is set progressively larger in diameter, in ever reducing increments, while the size of the diamond particles is also reduced. This arrangement allows tools with larger diamond particles that remove relatively large amounts of material, and tools with smaller diamond particles that have finer surface finish capabilities, to be used progressively for maximum efficiency.

Sample Multi-Tool Arrangement



The singlepass Processo is in contrast to conventional Levigatura were the tool or part is reciprocated many times; while the abrasive portion of the tool is gradually expanded, then contracted during each cycle. Another difference is in the abrasive bond of the tool. With the singlepass Processo, a single layer of diamonds is permanently plated onto the tool with approximately 50% of each diamond particle protruding from the bond. The benefits of this are twofold: greater diamond exposure allows for faster cutting/stock removal rates, and because the only wear that occurs on the plated tool come from the diamonds, tool size can be held for extremely long periods of time without adjustment. Conventional Levigatura tools normally utilize Abrasivis that have abrasive particles scattered throughout a specific depth in the bond. This type of tool requires the bond to wear so that new abrasive particles can be exposed, and provide a much smaller amount of chip clearance.