scholarly journals Seamless tube plant opens in Canada

JOM ◽  
1957 ◽  
Vol 9 (8) ◽  
pp. 1040-1040
Keyword(s):  
Seamless Tube ◽  
Tube Plant

Advancements in Cone-type Rotary Piercing Technology

1999 ◽  
Vol 121 (3) ◽  
pp. 313-320 ◽  
Author(s):  
Chihiro Hayashi ◽  
Masayoshi Akiyama ◽  
Tomio Yamakawa
Keyword(s):  
Small Diameter ◽  
Expansion Ratio ◽  
Seamless Tube ◽  
Hot Workability ◽  
Piercing Mill ◽  
Rotary Forging ◽  
Core Technology ◽  
Cone Type ◽  
High Feed ◽  
Tube Plant

A cone-type piercing mill was developed by the authors for materials with poor hot workability. This piercing mill is called “the super piercer” in Europe. It has a pair of cone-type main rolls supported at both ends with their roll axes inclined and crossed so as to enable piercing at high feed and cross angles. In order to ensure the best performance of the rotary piercing, disc rolls are adopted instead of plate guide shoes. The super piercer was put into practice at the small-diameter seamless tube plant operated in 1983. The recent progress in our research and development on the super piercer has resulted in the concept of “the new super piercer,” which allows expansion piercing. Namely, the development of the skewing technology for disc roll axes and its application to the cone-type piercing technology has realized remarkable increase in the expansion ratio. The new super piercer was adopted as the core technology of the new medium-diameter seamless tube plant operated in 1997. In this paper, studied in detail were the influences of the expansion ratio, feed and cross angles on the rotary forging effects, redundant shear deformations and power consumption.

Homogenization and Extrudability of 5056 Aluminum Alloy Billet

2019 ◽  
Vol 801 ◽  
pp. 233-238
Author(s):  
Cheng Hsin Hsiao ◽  
Sen Tian Kao ◽  
Wen Jauh Chen
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Oxide ◽  
Seamless Tube ◽  
Theoretical Level ◽  
Quality Problem ◽  
Billet Surface ◽  
Oxide Particles ◽  
Segregation Zone

Through a series of homogenization and extrusion experiments, the extrusion efficacy of 5056 seamless tubes is improved. Although better extrusion practice was apparent with better homogenization parameters for 5056 alloy, a little over-burning structure and phenomena were found on and in the surface and segregation zone of homogenized billet. The extrudability is worse than theoretical level with no aluminum and magnesium oxide particles on the billet surface. Additional, another quality problem in this study is the segregation zone in 5056 larger billets. The over-heat structure was smoothly flowed into the seamless tube by indirect extrusion, and that makes surface bubbles.

An experimental study of the mechanical properties of seamless and overlapped stitched composite tubes under hydrostatic pressure, lateral compression, and impact

2020 ◽  
Vol 55 (7-8) ◽  
pp. 212-221
Author(s):  
Masoud Yekani Fard ◽  
Brian Raji ◽  
Bao Doan ◽  
Michael Brooks ◽  
John Woodward ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrostatic Pressure ◽  
Maximum Pressure ◽  
Seamless Tube ◽  
Lateral Compression ◽  
Composite Tubes ◽  
Functional Failure ◽  
Stress Risers ◽  
The Matrix ◽  
Extent Of Damage

Mechanical properties and damage mechanisms of closed circular preforms and overlapped stitched composite tubes under lateral compression, impact, and hydrostatic pressure were studied. The functional failure pressures of the tubes with different boundary conditions were determined and compared. Stitch at the overlapped zone creates stress risers that lead to premature functional failure at a hydrostatic pressure at ∼1/3 of the theoretical maximum pressure of the tube as delamination occurs at the overlapping region. Seamless tubes reached values close to theoretical operating hydrostatic pressures before leakage was observed at the tube ends. The deflection of the overlapped stitched tube due to lateral compression is less than the deflection in the seamless tube, and it is limited to 5% of the inner diameter using the Spangler equation. Brittle kinks, cracks, and delamination occur in overlapped stitched tubes while seamless tubes regain the shape with limited localized cracks after unloading. The fabric architecture of a seamless tube allows for the reorientation of fiber tows as cracks develop in the matrix, thus resulting in a lesser extent of damage when the tube is subject to impact.

Numerical Simulation and Experimental Verification of Microstructure Evolution during the Seamless Tube Extrusion of Semi-Continuous Casting AZ31 Magnesium Alloy

2017 ◽  
Vol 898 ◽  
pp. 79-85
Author(s):  
Tao Lin ◽  
Ji Xue Zhou ◽  
Bai Chang Ma ◽  
Yun Teng Liu ◽  
Di Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Continuous Casting ◽  
Dynamic Recrystallization ◽  
Volume Fraction ◽  
Seamless Tube ◽  
Compression Tests ◽  
Extrusion Speed ◽  
Tube Extrusion ◽  
Az31 Mg Alloy

Based on the stress-strain curves at the temperature of 300-450 °C with strain rate of 0.01-1 s−1 by hot compression tests, the empirical dynamic recrystallization models for the semi-continuous AZ31magnesium alloy were developed. The dynamic recrystallization evolution during the seamless tube extrusion of the AZ31 Mg alloy was simulated by numerical method with the derived models and validated by experiment measurements. The results show that at certain extrusion speed the influence of the extruding temperature on the dynamic recrystallization fraction was significant. With the increase of the extruding temperature the volume fraction of dynamic recrystallization increase obviously. The predicted dynamic recrystallization fraction was in an excellent agreement with the experimental results.

scholarly journals Seamless Tube-Type Heater with Uniform Thickness and Temperature Distribution Based on Carbon Nanotubes Aligned by Circumferential Shearing

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3283 ◽  
Author(s):  
Yoonchul Sohn ◽  
Dongearn Kim ◽  
Sung-Hoon Park ◽  
Sang-Eui Lee
Keyword(s):  
Temperature Distribution ◽  
Axial Direction ◽  
Circumferential Direction ◽  
Laser Printer ◽  
Seamless Tube ◽  
Uniform Temperature ◽  
Rubber Composite ◽  
Tube Type ◽  
The Difference

The uniform temperature distribution, one of the requirements for long-term durability, is essential for composite heaters. An analytical model for temperature distribution of a tube-type heater was derived, and it revealed that thickness uniformity is one order more important than intrinsic material properties such as density, heat capacity, and electrical conductivity of the heating tube. We introduced a circumferential shearing process to fabricate a flexible, seamless tube-type heating layer of carbon nanotube/silicone rubber composite with outstanding uniform distribution of thickness and temperature, which may be attributed to a shorter characteristic dimension in the circumferential direction than in the axial direction. The temperature uniformity was experimentally verified at various temperatures under heating. The difference in measured thickness and temperature in circumferential direction was within ±1.3~3.0% (for tavg = 352.7 μm) and ±1.1% (for Tavg = 138.8 °C), respectively, all over the heating tube. Therefore, the circumferential shearing process can be effective for cylindrical heaters, like a heating layer of a laser printer, which fuse toners onto papers during printing.

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