Quality Control and Quality Control Tools
It is the control process that is carried out at every stage of production in order to meet the demands and expectations of the consumer in the best way for the product or service provided. It is to examine to what extent the quality standards determined during the production planning phase are complied with after production.
It checks whether the purchased material / raw material meets the pre-determined quality standards before entering the production, design etc. throughout the production process. examines the suitability of features such as what is requested. The main purpose is to detect unexpected failures in advance and to minimize the rate of defective products; To achieve the highest possible level of quality for the product or service offered.
The Quality Control process consists of some basic steps. First, the production process to be controlled is selected and then the quality standards targeted for the product are determined. Performance after production is measured and the quality standards of the targeted and the final product are interpreted, if there is a difference between the two, R&D studies are carried out, the product is re-produced to the targeted quality measure.
There are 7 quality tools in the Quality Control phase that are very effective in solving quality problems. These; Fishbone Diagram, Control Diagram, Pareto Analysis, Flow Diagram, Scattering Diagram, Histogram and Control Chart. Fishbone Diagram, based on the cause-effect relationship, based on the logic of "All the causes that cause the problem are caused by some resources"; It is created to show, visualize and analyze the reasons that bring about the results. Causes are divided into main categories in order to identify the sources causing the error, and sub-reasons such as people, methods, materials, measurements, environment, etc. are added to these categories. The main purpose is to prevent quality errors that may occur. The Control Diagram is used to monitor and examine the quality process. Pareto Analysis, on the other hand, lists the reasons under the increasing defective production or customer dissatisfaction in quality control according to their importance. The Scatter Diagram helps us see in detail what sources are causing our problem. While creating the Scattering Diagram, first a cause-effect table is drawn, then a Scattering Diagram is drawn to see the connections of the sources we have. Scattering Diagram with cause-effect table analyzes the sources of quality problems.