Abstract
The study comparing a geometry of the inner corners after milling operation of aluminum alloy 7075 elements was conducted. The influence of changes of technological parameters and types of treatment on the geometric accuracy of the samples was investigated. The correct process of corner milling involves the need to select the right feed speed as well as the correct engagement angle of the milling tool. Corner milling is problematic due to the increase of engagement angle in their area. This makes it much more difficult to perform stable machining and adversely affects the surface accuracy and geometry of the concave corners. The tests using various strategies and technological parameters for milling corners with variable opening angles were carried out. When analyzing the obtained results, conclusions were formulated indicating the relationship between the change of selected technological parameters of milling in the corners and the geometric accuracy of the samples tested.
Highlights
The main purpose of the presented study was to assess the impact of variable technological parameters on the geometric accuracy of the milled corner
The problem becomes evident when machining casting molds, forging, blow molding or thin-walled pocket constructions used for the aviation industry [1, 2]
The corner machining with a tool with a diameter corresponding to the radius of the processed corner is exposed to the occurrence of undercuts
Summary
The study comparing a geometry of the inner corners after milling operation of aluminum alloy 7075 elements was conducted. When analyzing the obtained results, conclusions were formulated indicating the relationship between the change of selected technological parameters of milling in the corners and the geometric accuracy of the samples tested. The problem becomes evident when machining casting molds, forging, blow molding or thin-walled pocket constructions used for the aviation industry [1, 2] In this type of elements there are small radii of corner roundings, often located in deep pocket openings, which requires large overhangs of the tool and may prevent the use of a smaller diameter tool. Often in small diameter corners - due to geometrical constraints - it is impossible to use a smaller diameter tool that would reduce the wrap angle For this reason, it is important to adopt an appropriate strategy for their treatment, which will not adversely affect its performance
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