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Related Concept Videos

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

207
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
207
Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

325
Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
325
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

207
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
207
Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

387
Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
387
Design of Transmission Shafts01:16

Design of Transmission Shafts

393
The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by...
393
Rolling Resistance01:21

Rolling Resistance

333
When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down...
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Operation of the Collaborative Composite Manufacturing CCM System
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Feed Curves for Controlling Ring Rolling Stability in Large-Scale Flat Ring Rolling Process.

Dan Xie1,2, Qiu-Yue Ouyang1,2, Luo-Yu He1,2

  • 1College of Material Science and Engineering, Chongqing University, Chongqing 400044, China.

Materials (Basel, Switzerland)
|May 13, 2023
PubMed
Summary
This summary is machine-generated.

A new staged feed strategy improves large-scale ring rolling stability by dividing the process into stages. This method controls plastic instability, reducing waste and production costs for large diameter rings.

Keywords:
coordinated feed curvefinite element methodlarge-scale ring rollingring rolling stability

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Area of Science:

  • Manufacturing Engineering
  • Materials Science

Background:

  • Large-scale ring rolling is prone to plastic instability due to significant wall thickness variations.
  • Existing feed curve strategies are often unsuitable for large-scale rings, leading to high production costs and material waste.

Purpose of the Study:

  • To develop a staged feed strategy to control rolling stability in large-scale ring manufacturing.
  • To minimize plastic instability and associated resource waste during the production of large diameter rings.

Main Methods:

  • Dividing the rolling process into stages based on instability evolution laws.
  • Designing the feed curve by coordinating all rolling stages using Central Composite Design (CCD).
  • Validating the feed curve through Finite Element Method (FEM) simulations and production trials.

Main Results:

  • A mathematical model was developed to generate radial feed curves for 5m diameter rings.
  • A rolling map was established to control roundness error, eccentricity, and vibration.
  • FEM simulations and production trials confirmed the reliability of the feed curve in the stable rolling region.

Conclusions:

  • The proposed staged feed strategy effectively enhances rolling stability for large-scale rings.
  • The developed feed curve and rolling map provide a reliable method for controlling dimensional accuracy and vibration.
  • This approach reduces machining amounts and material waste in large ring production.