Starting from the idea of improving Coordinate Measuring Machines’ (CMM) measurement strategy for inner thread locations, we developed a new method which increases the accuracy of measurements and takes us closer to the pitch diameter. This article will analyze this new method by testing different touching probes configurations for different thread sizes. The objective is to identify the best probe configuration to be used in the measurements of different inner thread sizes.
Measuring the true position of a cylinder with a Coordinate Measuring Machine became a simple fact for programmer developer, for this they have to choose between different strategies available on the CMM software to improve measurement accuracy. Everything is changing when we try to measure a true position threaded hole, during serial production this position will pass between some changes that will affect the profile of the thread and the beginning of the threaded hole. Although CMM cylinder strategies methods exist they are not efficiently developed for precise measurement of a thread position. This article will analyse the difference between current methods that are available on the market and will compare the results with an experimental new method, this new method is developed from the method available plus other tools available in the CMM software. The importance of this method is to increase thread position measurement precision during all production cycle time.
Coordinate measurement machines (CMM) are an important part of production process technology that help and give a fast response in complex measurement situations. Although the technologies advance in high speed, old coordinate measurement machines are capable to give accurate results. The present paper will give an alternative to use this type of machines, machines that are operated manual or with rudimental software that are not upgraded with actual technologies. In order to be possible to measure an inclined surface with a coordinate measurement machine we need to consider that the contact approach between the coordinate measurement machine tool and the measured part must respect some elementary steps: the movement of the coordinate measurement machine probe must be on same direction as the surface vector that we want to measure, the contact force must be the same as the force used for calibration of the probe. All this are very difficult to be respected with a manual or oldcoordinate measurement machine. During measurement with machines that doesn’t allow probe angle control an error can appear for surfaces that are positioned at an angle to the reference surface. This article presents one way to can eliminate measurement errors on Coordinate measurementmachines for inclined surfaces.
AbstractThis article is a research on the effect of material segregations due to squeeze parameters on mechanical properties of high pressure die cast parts. The technology of squeezing is applied in high pressure die casting technology with the aim to improve the internal material health of the castings from aluminium alloys, such as AlSi9Cu3(Fe), components incorporated in assemblies as mechanical and hydraulic parts. The objective of this article is to determinate the influence of the secondary effects of squeeze technology on the mechanical properties of parts produced from AlSi9Cu3(Fe) alloys, with HPDC technology.
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