One of the flagships of our production are the mechanically fastened boring bars, usually used in the automotive sector and in the production of large batches.
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One of the flagships of our production are the mechanically fastened boring bars , usually used in the automotive sector and in the production of large batches.
The boring tool , often made up of several insert seats, allows the machining of diameters , chamfers , radii , counterbores and shaped profiles at the same time with a single tool.
The use of a combined boring tool allows a reduction in machining times , thanks to shorter machine setup and tool change times. The practicality of this tool has made it an indispensable work tool not only for large productions, but also for the most current small series.
On the basis of the amount of stock to be removed , the type of machine and material to be processed, our team studies the optimal work cycle and consequently the tools necessary for production. In this way, roughing boring bars are designed that are able to remove most of the stock on the piece, thus preparing the surface for the subsequent passage of the finishing boring bars. These allow centesimal accuracies and finishes with reduced roughness to be achieved.
Depending on the requirements , the boring bars can be made with a fixed seat, cartridge seat or with micro-boring units . These latter elements are supplied together with the boring machine to offer a complete turnkey package. Should it be necessary, due to space constraints or the need to use a shaped insert, our production makes special tailor-made cartridges.
Items can be made with theconnection required by the customer: cylindrical, Weldon, Whistle Notch, Varilock, BT, ISO DIN 69871, to modular ones made from semi-finished products.
Our fixed-seat stretchers undergo a nitriding treatment (or other suitable treatment depending on the specificity) that ensures indeformability of the insert seats over time.
To allow the inalterability of the surface of the tool this is subjected to a phase of hot burnishing , rigorously carried out internally by our production to ensure the highest standards.
All our items are laser marked with product code, production batch and on request with datamatrix. To learn more about the importance of tool tracking and traceability, see our Tattools software.
Frequently, in the design of a boring tool, one has to deal with problems such as tool change times or the risk that the boring bar comes off or tends to bend with respect to the spindle due to its weight. These difficulties must be identified already in the design phase; Gaspari Utensili has studied ad hoc solutions to solve these situations . This is how lightened boring bars are created, characterized by the presence of cavities and drains that reduce their overall weight. With the same purpose, especially on large diameters, the boring bars are made by means of a graft ergal, a particular 7075 aluminum alloy that gives lightness to the boring bar, while ensuring good resistance to the tensions generated by the machining. The ergal boring bars are however equipped with ISO or special cartridges or with micro-boring units.
Another solution used in more recent years is to make the body of the boring bar with additive technology . This technique consists in making the tool by superimposing thousands of “layers” of Sufi metal powder by a laser beam. This procedure makes it possible to create an internal honeycomb structure which confers lightness and resistance to the boring bar at the same time.