Abstract
The paper is focused on the influence of the coolant pressure on the surface roughness of the workpiece when machining stainless steels. The components were machined on a STAR SR-32J dual spindle machining center and an external cooling unit HYTEK CHAV 160/150-AF-F-OL was used for cooling. Two stainless steel components were investigated, namely the gas control valve rod and the high-pressure control valve housing, which require low roughness Ra after machining (less than 0.375 and 0.25 micrometers respectively). The first component was tested at 8 different pressures in the range of 150 bar - 10 bar and the second component at 4 different pressures in the range of 120 bar - 10 bar. The roughness parameters were measured by the contact method using the MITUTOYO Surftest SJ-410 Roughness Tester and the Alicona InfiniteFocus optical microscope. Based on these sample input parameters, it was evaluated howmuch the pressure affects the surface quality or suggested its reduction due to the high cost of operation of the external high-pressure equipment.
Highlights
In today's modern trends in machining methods, it is necessary to keep up with competitors
The roughness parameters were measured by the contact method using the MITUTOYO Surftest SJ-410 Roughness Tester and the Alicona InfiniteFocus optical microscope
When measured in the Mitutoyo Roughness Tester, both values were still within the tolerance for the required surface roughness, while the measurements measured with the Alicona InfiniteFocus measured both below the required surface quality
Summary
In today's modern trends in machining methods, it is necessary to keep up with competitors. There is a range of materials in this area that are difficult to machine. Special equipment is required for both machining and cooling, which is an integral part of the stainless steel machining process. In the case of stainless steel machining, highpressure cooling is required to achieve the required surface quality under ideal cutting conditions. High-pressure cooling helps us to speed up the machining process while maintaining the required surface quality [6, 7]. The aim was to investigate the effect of high-pressure cooling on the surface roughness of the workpiece when machining stainless steels and to achieve the desired surface roughness, using adequate coolant pressure and streamlining production processes and associated manufacturing costs [8]
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