Lidia Marciniak-Podsadna

Ensuring the Reliability of the Car Body Controls by Controlling the Current Inspection of Measuring Machines

Coordinate measuring machines are one of the most often used measurement devices in modern industry. Keeping high level of their accuracy parameters becomes then a critical issue. In the paper, some aspects regarding CMM reverification in production conditions and periodical check were discussed. A method of periodical check was elaborated in order to obtain regular information about changes in accuracy parameters. Possible risks and consequences of lack of knowledge regarding current CMM accuracy status were indicated. The results of current research conducted on 6 CMMs with single and double column construction were shown. One common measurement program for all machines working in CNC mode was developed for repeatability. During 6 months, 106 studies were performed and 7326 points were collected. The paper presents also some extreme results of the check together with the discussion. The presented method was adapted to production conditions. Its use is associated with a small 15 min break in a working time of a coordinate measuring machine.

Measurement of Surface Topography Using Computed Tomography

Computed tomography is a new field of coordinate measuring metrology. For this reason, many areas of its application are not yet completely known. The paper presents reproduction possibilities of geometrical structure of a surface by computer tomography. Results are combined with data from a classical tactile profilometer to measure surface topography. Comparison of the obtained values makes it possible to confirm the usefulness of computer tomography to reconstruct the surface geometry. This is especially important when indoor surfaces are indispensable. Such measurement with any other device than computer tomograph is not possible or requires damage of the element being measured. As a result of the measurement by means of a computer tomograph, from the same measurement data we obtain not only information about the surface and shape of the element, but also—as an additional advantage—ability to evaluate internal structure of material, for example its porosity or fibre distribution in case of composites.

The use of IR thermography to show the mold and part temperature evolution in injection molding

Abstract This study concerns the application of infrared camera for injection molding analysis by measuring temperatures of both injection molded parts and injection mold cavities in a function of injection cycles. The mold with two cavities, differing in thickness (1 and 3 mm), and a cold direct runner was used. Isotactic polypropylene homopolymer was utilized to produce parts. Mold temperature was set at 22°C and controlled by a water chiller. Five measuring points were determined: SP1, SP2 (placed in the 3 mm cavity), SP3, SP4 (located in the 1 mm cavity) and SP5 around an injection molding gate. Our investigations showed that the highest temperature is localized around SP2 point and the lowest at SP4. Also, it was proved that even after 62 injection molding cycles, temperatures of cavities were not stable, revealing their further increase with each cycle.

Geometric Stability Measurements’ of Vehicles’ Pistons in Self-Cooling Process for Define Its Wear / Współrzędnościowe Pomiary Stabilności Geometrycznej Tłoków W Procesie Stygnięcia Dla Określenia Stopnia Ich Zużycia

Abstract The paper presents the investigation method allows for an analysis of failure of combustion engines piston surface. The essence of method is realization of precise measurement in various piston temperature and after that comparison of obtained results to reference piston - new one. Method has been presented on the basis of two pistons measurements. Streszczenie W pracy przedstawiono metodę badawczą pozwalającą na analizę uszkodzenia powierzchni tłoków wykorzystywanych w silnikach spalinowych. Istotą metody jest prowadzenie precyzyjnych pomiarów w różnych temperaturach tłoka uszkodzonego oraz odniesienie uzyskanych wyników do tłoka referencyjnego - nowego. Sposób prowadzenia badań z wykorzystaniem zaproponowanej metody przedstawiono na podstawie przeprowadzonych pomiarów z wykorzystaniem dwóch tłoków.