Improving the quality of critical tractor parts through the dynamic stabilisation of the manufacturing process in regard to CNC machines
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Kuupäev
2019
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Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
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Abstrakt
This article focuses on the evaluation of a rod improvement which is considered in detail
below. The rod in question is part of an hydraulic cylinder manufacturing process which takes place
on CNC machines. The need for ensuring a process improvement in this area arose because the rod
often breaks down under operational conditions. It was found that the cause of this is a finishing
operation in the existing production process. The effect of charging which occurred during the
grinding process brings about the embedding of abrasive particles into the workpiece surface layer.
Therefore, at the running-in stage, the mating surfaces on the rod and the system being used to seal
the rings both experience intense wear in their contact areas, with this being caused by abrasive
microparticles which serves to reduce the performance characteristics of the part in question.
However, even if we dispense with the grinding process, ensuring the necessary roughness of
Ra = 0.63 μm at the machining stage alone will present problems of their own for a number of
reasons. First and foremost is the connection with the phenomenon that results in an autooscillation processes which is generated by the manufacturing system, as well as the formation
of flow chips during machining on CNC machines. In this regard, in order to avoid any negative
factors creeping into the process, we propose that a new approach be taken in achieving the
necessary surface roughness, one which is based on the suppression of the auto-oscillation process
during machining by means of creating a selective metastable structure. At the machining stage, any
inhomogeneous structure in the local chip formation area will be destroyed, thereby suppressing the
auto-oscillation process and reducing the surface roughness. Eventually, the proposed method will
allows the grinding operation to be dispensed with entirely from the manufacturing process.
Kirjeldus
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Märksõnad
production process, local laser impact, metastable structure, machining process system, chip formation, auto-oscillation processes, surface roughness, articles