Numerical Simulation and Process Optimization of Internal Thread Cold Extrusion Process

Hou, Hongling; Zhang, Guangpeng; Chen, Xin; Zhao, Yongqiang

doi:10.3390/ma13183960

Cited by 13 publications

(3 citation statements)

References 10 publications

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“…In addition, CAE systems were introduced to design and analyse the taps [13]. ANSYS methods were used to determine deformations of the taps as if in real experimental environment [14,15]. Also, some statistical programs were performed to optimize the parameters used in tapping process [16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Reversal Loads in a Tapping Process

2024

Teh. vjesn.

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In the manufacturing industry, tapping tools are widely used for threading screws in drilled holes. It is expected that cutting loads would be affected by both the geometry of the tools and the cutting parameters in a tapping process. However, it is thought that such a simple mechanism does not exist. It is supposed that the tapping tools will encounter different loads while they are going forward and backward in the holes. Therefore, the unsteady loads that can lead to breaking the tools in the holes are important. In this study, tapping tests were performed on AISI 1050 steel. TiN-coated and uncoated HSS-E tools were used to cut M10 standard right screws on test parts. For this purpose, the test parts were thoroughly drilled with ø8.5 mm HSS drill bits. Then the tapping tools, which were manufactured in four different forms, were used to thread the screws in the holes. The tapping loads that are axial forces and torques were measured with a standard dynamometer. The experiments were carried out by using cutting fluid on a CNC milling machine. In conclusion, it is figured out that the axial forces and torques while the taps are going down the holes are more different than in the period the taps are going up the holes. While the tools were coming back at the end of the threading process the torques decreased, but the axial forces increased. Moreover, the heights values for the axial force and torque occurred by the TiN HSS-E tools that got straight-flute.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Reversal Loads in a Tapping Process

2024

Teh. vjesn.

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“…Inspired by this, researchers researched the cold extrusion processing technology in high-strength steel materials. In recent years, Stéphan et al [7][8][9] established a relationship between the diameter of the bottom hole, the profile and tooth height of the internal thread, studied the effects of different processing parameters on temperature and torque during the processing and optimised the extrusion effect. Li et al [10][11][12][13] obtained correction formulas for the area and volume of materials after extrusion deformation through the flow law of metals during cold extrusion, analysed the strengthening mechanism of internal threads.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of the residual stress distribution of internal thread cold extrusion and tap wear

Wan

Jing

et al. 2023

Strain

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In order to improve the thread‐forming quality of diesel engine piston connecting rod, the internal thread cold extrusion process was adopted for the through‐hole structure of 42CrMo4 high‐strength steel. The influence of different structural parameters of the tap on the residual stress distribution of the cold extrusion internal threads and self‐wear were discussed with the help of three‐dimensional elastic–plastic finite element model. The wear of tap was observed by an electron microscope, coordinated with the residual stress distribution of thread was measured by X‐ray diffraction to explore the relationship between residual stress distribution of the cold extrusion internal thread, tool wear and tap structure. The optimal combination of tap structure parameters of residual stress and tool wear was obtained through grey relation method. The residual compressive stress and the depth of stress layer near the thread surface increased and the wear condition of the extrusion tap was improved when the tap with optimised structural parameters was used for processing, while maintaining the original thread connection strength. The results show that the internal thread with better‐forming quality can be obtained by using the optimised extrusion tap, while the service life of the tap was prolonged.

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“…Li et al [11][12][13] elaborated the principle and characteristics of thread extrusion forming, and pointed out the plastic flow law of materials in the extrusion process. In recent years, Hou et al [14][15] analyzed the influence of critical process parameters of temperature and torque in the extrusion process of internal thread of alloy steel and the combination of machining parameters was optimized. Zuo et al [16] used low-frequency vibration to extrude trapezoidal threads and studied the influence of low-frequency torsional vibration on torque during extrusion.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of the Effect of Cold Extrusion Process on Residual Stress and Fatigue Life of Internal Thread of High Strength Steel

Wan

He²,

Jing³

et al. 2022

Preprint

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The internal thread cold extrusion process is improved to further increase the fatigue life of diesel connecting rod in order to improve its fatigue performance. Based on three-dimensional finite element model, the residual stress distribution around the cold extruded internal thread of 42CrMo4 high-strength steel plate hole structure under different edge distance ratios is analyzed in detail. The multiaxial fatigue life prediction model of thread is established based on stress-strain method, the accuracy and feasibility of the prediction model was further proved by fatigue experiments. The thread surfaces are examined by utilizing the scanning electron microscope, coordinate with the X-ray diffraction method to measure the residual stress of thread, the relationship between the residual stress distribution, surface structure and fatigue life of the extruded thread is revealed. The research shows that the improved fatigue prediction model gives a satisfactory accuracy in predicting the fatigue life, both of the tangential residual stress fields around the extruded thread and the surface structure have a certain influence on its fatigue life, especially when the edge distance ratio is less than 2. The tangential residual compressive stress of the cold extruded internal thread decreases with when the edge distance ratio being smaller, while the depth of the stress zone increases firstly and then decreases. Higher load will greatly reduce the fatigue life and dispersion of the thread, the fatigue life increases linearly with the increase of the edge distance ratio under lower stress level.

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Numerical Simulation and Process Optimization of Internal Thread Cold Extrusion Process

Cited by 13 publications

References 10 publications

Investigation of the Reversal Loads in a Tapping Process

Investigation of the Reversal Loads in a Tapping Process

Numerical and experimental investigation of the residual stress distribution of internal thread cold extrusion and tap wear

Numerical and Experimental Investigation of the Effect of Cold Extrusion Process on Residual Stress and Fatigue Life of Internal Thread of High Strength Steel

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