Papers by Keyword: Roller-Die Drawing

Abstract: This article determines the main factors influencing the quality of ERTi-7 titanium wire through building AHP-PQ model: processing technology. under the circumstance of instable quality of ERTi-7 titanium wire in international market. Through the selection of raw material, feeding material evenly during melting, control of melting times and the determination of surface machining process, the inhomogeneity of chemical compositions of ERTi-7 and the corresponding removal method are studied. The results show that it is easier to obtain ingot with good surface and fine structure using triple melting without increasing the content of Pd element, and then going through non-oxidation roller-die drawing process, we will obtain qualified titanium wire with good surface and also conforming to the request of AWS A5.16/A5.16M:2007.

Abstract: In the work orientation distribution functions (ODF) were determined for wires drawn in pressure and roller dies from a high carbon steel wire rod with a diameter 5.5 mm to wires with a diameter 3.8 mm and 3.0 mm. For a comparison ODFs for wires drawn conventionally were also determined. The texture was measured on the cross sections of investigated wires prepared in a form of squares to eliminate the effect of the surface layer. In the first stage of a drawing with a total reduction of 54.3% it has been found that in wires drawn conventionally (KI), in pressure dies (HI) and in roller dies (RI) a strong <110> fibre-texture exist with a value of the ODF equal to about 3.2 for all tested wires. At an increase of the total reduction from 54.3% to 71.5% values of ODF were different for different methods of drawing. For wires with a diameter 3.0 mm drawn conventionally (KF) it was equal 4.25 and for wires drawn in pressure dies (HF) the ODF value was the highest and equal to 4.4. For wires drawn in roller dies the ODF value was the lowest and equal only to 2.6. It means that in spite of the increase of the total reduction roller die drawing results in a decrease of the sharpness of the fibre texture <110>. In conventional drawing and in pressure dies drawing an increase of the <110> texture has been noticed with the increase of the total reduction. In addition to a strong <110> texture component, specimens K and H also featured weak <311> and <310> components. In R specimens there were more of such additional components after the first stage of drawing i.e. <311>, <310>, <210>, <211> and after the second stage of drawing (total area reduction 71.5%) - <311>, <310>.