This article describes some of the tools used for quality control in injection moulding. The quality control tools are introduced and their use is demonstrated in the next section with a practical example. The selection of appropriate methods was based on proven quality control methods that were chosen to work in synergy with each other. The use of FMEA, Ishikawa diagram and Pareto diagram isdemonstrated by a practical example. Quality control Control processes Injection moulding Plastic technology Ishikawa diagram FMEA Pareto Diagram
The article presents a comprehensive example that demonstrates the control of a plastic injection process in practice. The demonstrated example is from an unnamed company and the data had to be adjusted by a coefficient. It includes measurement and analysis of the production process, its control using a control diagram to bring the production process to a state under statistical control by applying tests of non-random clusters and subsequent evaluation of process capability. The paper shows a histogram and control charts from the measured values that were obtained from the production process at the time. The last part of the article gives an example of the maintenance of economical statistical optimization for four scenarios. Here, the costs that the company incurs in maintaining the machinery are taken into account. The data in the example was again modified by the author so that the company was not easily traceable.
This paper describes experimental measurements of travel rollers on a polyurethane thread. This experiment took place at the CTU Faculty of Mechanical Engineering in the laboratory of the Department of Design and Machine Parts. The experiment was performed within the project of a lightweight type of sampler, designed by a team of collaborators from our institute for OK Servis BioPro, s.r.o. For the newly designed type of sampler, it was necessary to determine the operation of a newly designed grain sampler. The load of the rollers is different in each environment. This paper presents the average values from the measurement, including its evaluation. Moreover, the paper compares different temperatures that can be achieved in the practice. Negative temperature values were not performed, as this measurement would be expensive and inefficient.
Grain samplerExperiment Measurement Travel roll Polyurethane
This paper presents a simple way of derivation of analytical solution for the stress (load) redistribution within a simple beam composed of multiple individual profiles. To demonstrate the main ideas a cantilever beam is considered, consisting of finite number of parallel sub-beams. The external load applied to the beam is shared and redistributed among the individual sub-beams depending on their stiffness (flexural rigidity). The procedure of obtaining the shear force and bending moment diagrams for individual sub-beams is explained in detail, leading to analytical formulas for the shearing and bending load for individual sub-beams, allowing for determination of the corresponding stress. To conclude the work, the possible applications and extensions of the presented approach are discussed. This work is a follow-up of our previous study providing the analytical solution for elastic line (i.e. deflection) of this kind of simple beams.
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