Limits...
The effects of forming parameters on conical ring rolling process.

Meng W, Zhao G, Guan Y - ScientificWorldJournal (2014)

Bottom Line: The effects of ring's outer radius growth rate and rolls sizes on the uniformities of PEEQ and temperature distributions, average rolling force, and average rolling moment were studied.The results indicate that the PEEQ at the inner layer and outer layer of rolled ring are larger than that at the middle layer of ring; the temperatures at the "obtuse angle zone" of ring's cross-section are higher than those at "acute angle zone"; the temperature at the central part of ring is higher than that at the middle part of ring's outer surfaces.Finally, the optimal values of the ring's outer radius growth rate and rolls sizes were obtained.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong 250061, China.

ABSTRACT
The plastic penetration condition and biting-in condition of a radial conical ring rolling process with a closed die structure on the top and bottom of driven roll, simplified as RCRRCDS, were established. The reasonable value range of mandrel feed rate in rolling process was deduced. A coupled thermomechanical 3D FE model of RCRRCDS process was established. The changing laws of equivalent plastic strain (PEEQ) and temperature distributions with rolling time were investigated. The effects of ring's outer radius growth rate and rolls sizes on the uniformities of PEEQ and temperature distributions, average rolling force, and average rolling moment were studied. The results indicate that the PEEQ at the inner layer and outer layer of rolled ring are larger than that at the middle layer of ring; the temperatures at the "obtuse angle zone" of ring's cross-section are higher than those at "acute angle zone"; the temperature at the central part of ring is higher than that at the middle part of ring's outer surfaces. As the ring's outer radius growth rate increases at its reasonable value ranges, the uniformities of PEEQ and temperature distributions increase. Finally, the optimal values of the ring's outer radius growth rate and rolls sizes were obtained.

Show MeSH

Related in: MedlinePlus

The changing curves of the maximum, minimum, and average PEEQ and SDP with driven roll's bottom radius.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4150487&req=5

fig12: The changing curves of the maximum, minimum, and average PEEQ and SDP with driven roll's bottom radius.

Mentions: Figure 12 shows the changing curves of the maximum, minimum, and average PEEQ and SDP with driven roll's bottom radius. In Figure 12, with the increase of the driven roll's bottom radius, the minimum PEEQ is basically unchanged; the maximum and average of PEEQ slightly decrease at first and then keep unchanged; SDP decreases rapidly at first and then increases slowly. Based on the conditions of Case 2 and ((18)), when the peripheral speed of the driven roll and ring's outer radius growth rate are unchanged, the feed amount per revolution is invariable. According to ((7)), when the feed amount per revolution is invariable, with the increase of the driven roll's bottom radius from 100 mm to 600 mm, the length of the contact circular arc and the contact areas between the conical ring and the driven roll increase, which results in the ring being more easily forged penetrated. Moreover, with the increase of the driven roll's bottom radius from 600 mm to 800 mm, the contact areas between the conical ring and driven roll further increase, and thus the heat loss between the conical ring and rolls increases, which leads to the increase of material yield strength and the decrease of the forged penetrated ability of the ring.


The effects of forming parameters on conical ring rolling process.

Meng W, Zhao G, Guan Y - ScientificWorldJournal (2014)

The changing curves of the maximum, minimum, and average PEEQ and SDP with driven roll's bottom radius.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4150487&req=5

fig12: The changing curves of the maximum, minimum, and average PEEQ and SDP with driven roll's bottom radius.
Mentions: Figure 12 shows the changing curves of the maximum, minimum, and average PEEQ and SDP with driven roll's bottom radius. In Figure 12, with the increase of the driven roll's bottom radius, the minimum PEEQ is basically unchanged; the maximum and average of PEEQ slightly decrease at first and then keep unchanged; SDP decreases rapidly at first and then increases slowly. Based on the conditions of Case 2 and ((18)), when the peripheral speed of the driven roll and ring's outer radius growth rate are unchanged, the feed amount per revolution is invariable. According to ((7)), when the feed amount per revolution is invariable, with the increase of the driven roll's bottom radius from 100 mm to 600 mm, the length of the contact circular arc and the contact areas between the conical ring and the driven roll increase, which results in the ring being more easily forged penetrated. Moreover, with the increase of the driven roll's bottom radius from 600 mm to 800 mm, the contact areas between the conical ring and driven roll further increase, and thus the heat loss between the conical ring and rolls increases, which leads to the increase of material yield strength and the decrease of the forged penetrated ability of the ring.

Bottom Line: The effects of ring's outer radius growth rate and rolls sizes on the uniformities of PEEQ and temperature distributions, average rolling force, and average rolling moment were studied.The results indicate that the PEEQ at the inner layer and outer layer of rolled ring are larger than that at the middle layer of ring; the temperatures at the "obtuse angle zone" of ring's cross-section are higher than those at "acute angle zone"; the temperature at the central part of ring is higher than that at the middle part of ring's outer surfaces.Finally, the optimal values of the ring's outer radius growth rate and rolls sizes were obtained.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, Shandong 250061, China.

ABSTRACT
The plastic penetration condition and biting-in condition of a radial conical ring rolling process with a closed die structure on the top and bottom of driven roll, simplified as RCRRCDS, were established. The reasonable value range of mandrel feed rate in rolling process was deduced. A coupled thermomechanical 3D FE model of RCRRCDS process was established. The changing laws of equivalent plastic strain (PEEQ) and temperature distributions with rolling time were investigated. The effects of ring's outer radius growth rate and rolls sizes on the uniformities of PEEQ and temperature distributions, average rolling force, and average rolling moment were studied. The results indicate that the PEEQ at the inner layer and outer layer of rolled ring are larger than that at the middle layer of ring; the temperatures at the "obtuse angle zone" of ring's cross-section are higher than those at "acute angle zone"; the temperature at the central part of ring is higher than that at the middle part of ring's outer surfaces. As the ring's outer radius growth rate increases at its reasonable value ranges, the uniformities of PEEQ and temperature distributions increase. Finally, the optimal values of the ring's outer radius growth rate and rolls sizes were obtained.

Show MeSH
Related in: MedlinePlus