![]() ![]() Quality assurance of part cleanliness goes beyond the analysis of particulates, films and chemical residues. Industries, associations and research institutes are working on recommendations, regulations, as well as the technology used. made with dyne testing pens that determine the surface tension. There are no recognized institutional standards with a broad comparative basis for these residues, nor are there any corresponding technical measurement solutions other than controls for films and chemical residues such as those that remain on metal surfaces as a result of cooling lubricants or chemical cleaners. The standards defined in ISO 16232 instead describe how to perform the analyses and how the results must be reported: for each component the standard cleaning level to be respected is defined and the importance of test repeatability is emphasized. In the second part of the document, however, we find all those aspects of cleaning that must be considered and respected within the production lines. Next to the definitions you can find a series of examples and case studies to take as a reference. and filtration and, finally, to methods of analysis. This document provides the guidelines on basic concepts of cleaning, to the ways in which the inspection methods should be chosen, to the methods of handling the samples under test, to the qualification and relief texts of the famous blank level, to the extraction methods. VDA Volume 19 is the first comprehensive standardization document to deal with the approaches and procedures for characterizing the cleanliness of products within the automotive industry’s quality chain. VDA 19 and ISO 16232 standards provide guidelines in the field of the technical cleanliness of manufactured parts especially in the automotive industry. In many applications, the quantity of residual particles on the surface of the components represents an aspect of the Quality and a parameter for evaluating the washing cycle. VDA 19 and ISO 16232: the benchmarks for the quality of metal cleaning systems This is the reason why cleaning requirements and analytical cleanliness checks have become more stringent over time. In some cases a cleaning defect does not become evident immediately and can only be detected when the component is already mounted. The next processes indicate that the detergent, solvent or in any case the cleaning process, is or is not up to the required parameters. ![]() The residue limit values or residue quantities considered harmful must be determined on the basis of specific technical requirements and not on the basis of what is technically feasible in the cleaning process.Įxcessive cleaning requirements often lead to excessive waste and a relative increase in costs linked to quality and subsequent rework. This is achieved by setting up control procedures and multiple instruments to perform the analysis.įrom a practical point of view, the residues on the surfaces of the treated metals cannot be completely eliminated and not always, or not necessarily, can be considered harmful. In the field of industrial metal cleaning machines, Quality control is focused to fulfill the surface cleaning specifications which are required for further processing and / or for the entire workflow.
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