Search results for "metalwork"
showing 3 items of 53 documents
Tērvetes pilskalna akmens lejamveidnes
2017
No analizētajām Tērvetes pilskalna 25 lejamveidnēm 2 ir pusfabrikāti. 10 veidnēs liets metāls, 11 bijusas nelietotas, 2 veidnēm lietosana nav nosakāma. 10 veidnes bija t.s. vāciņi - veidnes apģērba apsuvju un piekariņu aizmugures iegūsanai. Septiņas veidnes bijusas apvērsamās - ar ielietnēm akmens plāksnīsu augsā un apaksā. Akmens plāksnītes - lejamveidnes izgatavosanas procesā ir slīpētas un atsevisķos gadījumos pulētas. Veiddobumi pārsvarā izgriezti ar nazi.---The article analyses 25 finished and semi-manufactured stone casting moulds found at the hill-fort of Tērvete, dated to the 11th–13th century. In terms of construction they all are two-part moulds. Ten moulds have been used for cast…
The Relevance Of The Preform Design In Coining Processes Of Cupronickel Alloy
2007
Coining is a forging process in which a metallic disk, characterized by a low volume‐surface ratio, is deformed with the aim to impress 3D images on its three surfaces. Due to the large production volumes and, at the same time, to the high quality standards required to the final products in terms of final dimensions, tolerances and surface finishing, such closed‐die, cold forging process requires a careful evaluation and choice of the proper operative parameters. In particular, along with technological parameters as the die velocity, die stroke and lubrication, which, in turn, contribute to affect the pressure values on the die surfaces, and thus the press choice, geometrical parameters as …
Misfit evaluation of dental implant-supported metal frameworks manufactured with different techniques: Photoelastic and strain gauge measurements
2016
This study aims to compare in-vitro the fitting accuracy of implant-supported metal frameworks used for full-arch orthodontic restoration. The hypotheses tested were as follows: (1) for a fixed implant morphology, strains developed within the framework depend on how the framework had been fabricated and (2) stresses transferred to the implant–bone interface are related to the amount of framework misfit. Metal frameworks were fabricated using four different manufacturing techniques: conventional lost-wax casting, resin cement luting, electrospark erosion, and computer-aided design/computer-aided manufacturing milling. Each framework was instrumented with three strain gauges to measure strai…