Papers by Keyword: Burrs

Abstract: The article presents the features of vibration processing of parts of electronic equipment in granular media. The method of combined processing by mixing granules with cutting and activating properties is considered as one of the ways to increase the intensity of vibration treatment. The increase in intensity is experimentally confirmed on the basis of a multivariate experiment with the construction of a regression model of the process.

Abstract: Cutting fluid plays an important role in machining processes to achieve dimensional accuracy, reduce tool wear, and improve tool life. Use of flood cooling conventionally used in machining is not cost effective and consumption of huge amount of cutting fluids is not health and environmental friendly. Therefore, one of the alternatives is to use minimum quantity of lubrication (MQL) in machining process. MQL is eco-friendly and has economical advantage on manufacturing cost. Study of the effects of MQL on burrs and aspect ratio should be carried out because burrs and aspect ratio are important issues in microdrilled parts used as microfluidic channels in bio-medical applications. In case of micromachining, flood cooling is not recommended to avoid any possible damage of the microstructures. As a result alternative solutions are sought. This paper investigates and compares burrs and aspect ratio in dry microdrilling and microdrilling with the presence of MQL on aluminium alloy 1100. The relationship among tool diameter, feed rate, and spindle speed on the area affected by burrs and drilled hole aspect ratio are analysed. The values of aspect ratio for both conditions show that there is slight improvement on aspect ratio in MQL over dry drilling. MQL has significant influence on affected area by burrs. It is observed that low spindle speed, high feed rate, and bigger drill diameter should be used along with MQL to reduce burrs.

Abstract: Micro-channels are widely used in many fields. There are a lot of burrs in the process of micro-channel machining, which affect the performance of micro-channels. In this study, some polishing experiments are conducted for the burr removal of micro-channels by the micro slurry jet on the home made micro slurry jet machining system. The morphology and the roughness of the micro-channels are measured. The factors to influence the burr removal and the micro-channel surface quality are analyzed in order to take measures to improve the surface quality. The results show that the micro slurry jet polishing not only removes the micro channel burrs, but also improves the micro channel surface quality. It is helpful to increase the flow of medium inside micro channel.

Abstract: Laser cooling is one of the critical problems in the research of high power semiconductor lasers. This paper provides an overview of microchannel heat sink which is used to cool the high power semiconductor lasers. The method of polishing after cutting is the current processing method of the heat sink, which is because the ordinary cutting method cannot meet the requirements of high quality of surface and edge burrs. This paper proposes ultra-precision fly cutting method for heat sink machining to omit the polishing processing to improve the machining efficiency, and verifies by experiments that the feasibility of the processing method and the edge quality improved by workpiece superposition processing method.

Abstract: Small pieces of metal are generated during trimming of automotive body panels. Commonly referred to as slivers, these pieces can be imprinted into the surface of stamped panels. This may require metalfinish of every stamped exterior panel. The objective of the paper is to study the influence of trimming conditions on quality of trimmed surface and to modify the trimming process to eliminate slivers and burrs from the trimmed surface. Suggested solution includes two measures: 1) building an elastic support of the offal eliminating bending of the area of the blank being trimmed off; 2) creating the preference of crack propagation from the lower shearing edge by machining a small radius on the upper shearing edge.

Abstract: The examination of deburring and surface finishing (DSF) quality was held at the enterprises of Russia. Here are the results of the examination. It was held on the base of general conclusion from the Scientific Research Institute “V and T” investigation results. The practical use of DSF at the engineering plants was also taken into account.