Abstract
In recent years, titanium and nickel alloys have become relevant in the production of aeronautic and astronautic parts. Since both nickel and titanium alloys have a very small thermal conductivity, the used tool will suffer huge damage from the heat generated during a grinding process. Therefore, there is a requirement for a durable tool with excellent cooling capacity. In this research, a new forced cooling technology that uses high-pressure coolant for machining difficult-to-machine materials was developed and evaluated. Here, a through hole on the rake face near the turning tool tip was machined by electrical discharge machining. Then, high-pressure coolant was supplied to the turning tool from the machined hole. Several values of pressure were experimentally performed. It is concluded from the results that the technology could effectively cool the area near the tip of a turning tool, and that the chip was also effectively removed by the high-pressure coolant.
Highlights
Titanium and nickel alloys have become relevant as they are widely used as aircraft materials
It has been observed that high-pressure or jet coolant streams are an option to alter the thermal behavior near the machining zone, including both neat oils and water-soluble oils, and provide an improved tool-life through changes in chip geometry and breakability, friction interactions and other parameters [9]
Supply of high-pressure coolant has been mostly focused on positioning coolant outlets on the tool and near the machining zone [10]
Summary
Titanium and nickel alloys have become relevant as they are widely used as aircraft materials. Optimization of conventional high-pressure coolant machining of difficult-to-machine materials has been widely performed, and alternative cooling methods such as cryogenic machining are currently being explored [5,6,7,8,9]. It has been observed that high-pressure or jet coolant streams are an option to alter the thermal behavior near the machining zone, including both neat oils and water-soluble oils, and provide an improved tool-life through changes in chip geometry and breakability, friction interactions and other parameters [9].
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