Jakub Matuszak

Edge states after wire brushing of magnesium alloys

Purpose – The purpose of the article is to investigate the influence of deburring by wire brushing upon states of magnesium alloy edges. Design/methodology/approach – AZ91HP and AZ31 magnesium alloy samples were machined with the use of recommended, catalog milling parameters. Burrs formed at the edges after milling were removed by brushing. Three different kinds of brushes were tested. Edge states (values of edge radius) after wire brushing were specified. Surface roughness was measured near the brushed edges. Findings – Experimental results show that wire brushing is an efficient deburring method, which can be fully automated on machining centers. Depending on the requirements, specific values of edge radius as well as surface roughness may be obtained. Practical implications – The article will help technological process designers select tools for deburring after milling of magnesium alloys. Originality/value – The paper presents the automated deburring method which can provide the required edge radius ...

Effect of brushing parameters upon edge states after wire brushing of AZ91 HP magnesium alloy

When the tool leaves the part during machining operations, burrs can form as a result of material plastic flow. Wire brushing is one of burr removing methods. Low cost of brushes which can be mounted in a milling center gives the perspective of developing this method. The article was aimed at presenting the results of brushing process upon edge radius after wire brushing of AZ91HP magnesium alloy. Three kinds of brushes were tested with different types of fibers and the diameter of a single fiber. Brass and steel brushes were used.

Dynamic Diameter Determination of Circular Brushes

After milling process burrs can form as a result of plastic deformation of the material. Wire brushing can be used as a fully automated method of deburring on machining centres. In order to provide the same effects after brush change it is important to precisely determine the tool diameter. The article presents the method of dynamic diameter determination of circular brushes, which is the diameter of the brush during rotation.

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

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.

The Effect of Machining Conditions on the Forces in the Process of Roller Brush Machining

Because of its advantages, brushing processing has many uses. The main ones include the removal of corrosion products, surface cleaning, deburring and shaping the properties of the surface layer. The intensity of these processes depends on the degree of impact of brush fibres on the work surface. In the case of tools, in which the resilient fibres are the working elements, forces in the brushing process, apart from the machining parameters, depend on the characteristics and overall dimensions of individual fibres. The paper presents the results of studies of the influence of technological parameters and type of fibres on the radial force in the brushing process.