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Related Concept Videos

Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
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Frictional Forces on Screws01:17

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Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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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...
269
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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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...
258
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

268
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
268
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

507
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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Updated: Sep 22, 2025

Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
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Research and Optimization of Process Parameters for Internal Thread Forming Based on Numerical Simulation and

Qiang He1,2, Yuxiang Jiang1, Xuwen Jing1

  • 1School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China.

Materials (Basel, Switzerland)
|May 20, 2022
PubMed
Summary

Optimizing internal thread forming reduces extrusion torque and temperature by 19% and 15% respectively. This enhances thread quality, surface condition, and hardened layer depth for marine diesel engine components.

Keywords:
internal threadnumerical simulationparameter optimizationphysical testthread forming

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Manufacturing Processes

Background:

  • Improving the quality of extruded threads is crucial for mechanical component reliability.
  • Extrusion torque and temperature significantly impact thread forming quality.
  • Optimizing machining parameters is key to enhancing thread performance.

Purpose of the Study:

  • To reduce extrusion torque and temperature in internal thread forming.
  • To optimize process parameters for improved thread quality.
  • To investigate the effects of various parameters on thread forming.

Main Methods:

  • Combined finite element analysis and experimental research.
  • Numerical simulation to analyze the effects of bottom hole diameter, machine tool speed, and lubrication medium.
  • Orthogonal design for process parameter optimization.

Main Results:

  • Optimized parameters for M22 × 2 internal thread in 42CrMo4 steel: 21.20 mm bottom hole diameter, 40 RPM machine tool speed, and PDMS polydimethylsiloxane coolant.
  • Reduced maximum extrusion torque by 19.27% and maximum extrusion temperature by 15.07%.
  • Improved thread surface condition, increased surface microhardness by ~5 HV0.2, and enhanced hardened layer depth by 0.05 mm.

Conclusions:

  • The optimized thread forming process significantly improves thread quality.
  • Parameter optimization effectively reduces critical machining factors like torque and temperature.
  • Enhanced thread properties ensure connection strength and surface integrity for demanding applications.