Analysis of deburring effectiveness and surface layer properties around edges of workpieces made of 7075 aluminium alloy

Abstract

Purpose This paper aims to present a comprehensive analysis of deburring effectiveness and surface layer properties after deburring process by wire brushing from milled 7075 aluminium alloys objects. Edge states (rounding, chamfering), surface roughness around the edge, microhardness and residual stress distribution were analyzed. Design/methodology/approach During the machining process, undesirable phenomenon occurs, which is the formation of burrs at the edges of workpieces. They occur in most elements formed by machining. There are many methods that can be used for deburring, but in the case of large components, typical of aerospace industry, using certain methods becomes difficult or uneconomic. Taking advantage of the fact that a part is mounted on the machine, it is advisable to make deburring operation the last action. This operation can be carried out by wire brushing. Findings On the basis of conducted studies, it was demonstrated that it was possible to choose such technological brushing conditions as to ensure an effective process of deburring, form appropriate edge state and generate the desired surface layer properties. Practical implications The method presented in the article allows for efficient, automatic deburring, especially for large components made of 7075 aluminium alloy. This eliminates manual, time-consuming methods of removing burrs by locksmiths. Moreover, the results allow to evaluate changes occurring in the surface layer after brushing process. Originality/value Results of brushing experiment provide full information on selection of technological parameters to obtain the required surface roughness and edge state. Moreover, analysis of surface layer properties (microhardness, residual stress) allows to assess the degree of impact hitting fibre on the workpiece.

Effect of Centrifugal Shot Peening on the Surface Properties of Laser-Cut C45 Steel Parts

“…The surface texture formed during processing affects the energy state and the adhesive properties of the surface [28,29]. One positive effect of shot peening, apart from the fact that it improves the properties of the surface layer, is the rounding of the workpiece edges [30]. Centrifugal shot peening can also be combined in a single operation with grinding while using hybrid tools that enable the processing of difficult-to-cut materials, such as nickel and titanium alloys [31].…”

Application of neural network in determination of parameters for milling AZ91HP magnesium alloy with surface roughness constraint

“…In practice, it is predominantly described by surface and area roughness parameters (e.g. Ra -arithmetical mean height of the profile, Rz -maximum height of the profile, or Saarithmetical mean height of the surface), which constitute fundamental characteristics of machinability of materials [4,7]. There are numerous factors affecting surface quality, the knowledge of which allows engineers to design a suitable technological process for a given application.…”

Surface Quality in Milling of AZ91D Magnesium Alloy

“…One of the effects of machining (e.g. milling or brush treatment) is the modification of surface roughness [8]. Milling, drilling or boring typically constitute the final operation in machining; hence in many cases, in addition to adequate process efficiency and effectiveness, it is also important to properly structure the surface roughness, furthermore accounting for the functional characteristics of a given surface of magnesium alloy workpieces [4].…”

“…plastic forming, to preliminary preparation of semi-finished products for further processing, e.g. using the AWJM method [18], and brush treatment (edge deburring) [8] there is a need for a broader description of the surface finish quality of workpieces. In the vast majority of the analysed literature, descriptions mainly pertain to the basic Ra roughness parameter; this seems to be highly insufficient given the utilitarian characteristics of magnesium alloy workpiece surfaces.…”