A Two-Step Marginal-Restraint Mandrel-Free Spinning Method for Accuracy in Forming Large, Special-Shaped Aluminum Alloy Tank Domes [PDF]
Metals, 2023 The special-shaped tank dome of a launch vehicle is a large, thin-walled, curved structure that is difficult to form using the conventional center-restraint spinning method.
Lijun Zhu +4 more
doaj +4 more sources
Research on marginal-restraint mandrel-free spinning of large thin-walled aluminum alloy domes with large bottom reserves [PDF]
The International Journal of Advanced Manufacturing Technology, 2023 Abstract The marginal-restraint mandrel-free spinning method can solve the problem of instability when spin-forming thin-walled head blanks. However, when shear-expansion compound forming is adopted for a large diameter head, the sinking phenomenon that occurs during the expansion spinning stage makes it impossible to accurately form the head ...
Lijun Zhu +4 more
semanticscholar +4 more sources
An Experimental Study for the Development of Mandrel-Free Hot-Spinning for Large Size Titanium Alloy Plate Forming [PDF]
Journal of Engineering for Gas Turbines and Power, 2018 A mandrel-free hot-spinning was developed as a near-net-shape titanium alloy plate forming technique. In this work, a Ti–6Al–4V alloy conical product with a wall angle of 34 deg and 170 mm height was formed from a large size Ti–6Al–4V plate (890–920 mm diameter × 30 mm thick). The product was characterized metallurgically and mechanical properties were
Yoshihide Imamura +5 more
semanticscholar +5 more sources
An investigation of mandrel-free spinning
Procedia Manufacturing, 2019 Abstract Spinning is a sheet metal forming technique conventionally used to form axisymmetric shapes. Recently a flexible mandrel-free spinning process was successfully used to form non-axisymmetric geometries. In this mandrel-free spinning process, numerically controlled rollers are used instead of a mandrel, allowing for savings in the lead-time ...
Evripides G. Loukaides, Kishore Jawale
semanticscholar +4 more sources
Toolpath generation for asymmetric mandrel-free spinning
Procedia Engineering, 2017 © 2017 The Author(s). Spinning of sheet metal traditionally employs a mandrel to form axisymmetric parts. In this work, forming of highly asymmetric parts through spinning is shown to be possible without the use of dedicated tooling through several physical trials. This technology eliminates the need for a mandrel and hence significantly reduces costs,
Evripides G. Loukaides, Iacopo M. Russo
semanticscholar +4 more sources
Deformation characteristics of Ti-6Al-4V plate in mandrel-free hot spinning
Procedia Manufacturing, 2018 Abstract A mandrel-free hot spinning process was developed as a near-net-shape forming technique for a titanium alloy plate. To investigate the deformation characteristics in a mandrel-free hot spinning, a Ti-6Al-4V alloy conical product was formed from a plate which has small penetration holes.
Yoshihide Imamura +5 more
semanticscholar +4 more sources
Process Parameters Optimization of One-Step Spin Forming of Top Cover with Center Flanged Hole
Metals, 2023 To assist the low-cost manufacturing of tanks, a one-step method of marginal-restraint mandrel-free spin forming is therefore proposed in this study for the forming of top covers with flanged holes.
Lijun Zhu +4 more
doaj +2 more sources
Two-Step Spin Forming of Thin-Walled Heads with Lateral Normal Flanged Holes
Metals, 2023 A thin-walled head with a lateral normal flanged hole is a key part of a propellant tank, and its low-cost and high-precision forming process is very challenging.
Lijun Zhu +4 more
doaj +2 more sources
Investigation of forming accuracy in mandrel-free hot-spinning
Procedia Engineering, 2017 Abstract A new mandrel-free hot-spinning was developed as a new near-net-shape forming technology. Hot-spinning provides a high flexibility, because of no mandrel. This paper investigated the material properties and dimensional accuracy of mandrel-free hot-spun Ti-6Al-4V alloy conical product with a wall angle of 30°at 900°C.
Ken Ikawa +4 more
openaire +3 more sources
Field-Free Spin–Orbit Torque Driven Switching of Perpendicular Magnetic Tunnel Junction through Bending Current [PDF]
Nano letters (Print), 2023 Current-induced spin–orbit torques (SOTs) enable fast and efficient manipulation of the magnetic state of magnetic tunnel junctions (MTJs), making them attractive for memory, in-memory computing, and logic applications.
V. Kateel +12 more
semanticscholar +1 more source