Tribological aspect of lubrication in form tapping of high‐strength steel

Bierla, Aleksandra; Fromentin, Guillaume; Martin, Jarad; Mogne, Thierry Le; Genet, Nicole

doi:10.1002/ls.62

Cited by 15 publications

(6 citation statements)

References 8 publications

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“…On the other hand, the workpiece material exhibits higher resistance due to the strain hardening effect generated during the thread-forming process of the extrusion tap, which exacerbating the wear of the tap. There are some researches [22,23] on the effects of material strength and lubricants on tool wear. Similarly, Xu et al [24] proposed a new tool wear monitoring and prediction model, which was validated through the corresponding tapping experiment.…”

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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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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“…The nanoparticles in the forming process were studied by the authors in [ 10 ], with a tremendous effect on the forming process of metal containers. All of these works and many others [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ] inspired the authors of the paper to thoroughly study the effect of polymers in a forming technology from several aspects. The selection resulted in the production of thread by forming taps.…”

Section: Introductionmentioning

confidence: 99%

Exquisite Energy Savings at Cold Metal Forming of Threads through the Application of Polymers

et al. 2022

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One of the global problems today is energy—its production and distribution. As the human population grows, the consumption of energy rises simultaneously. However, the natural sources are limited, and so the focus on power savings becomes more and more important. One of the ways to reduce consumption is the use of effective lubricants and tribological fluids in industry, especially in processes with high demands on energy but high quality of products as well. Forming is a typical example of such technology, and the application of polymers seems to be a very important challenge, because the application of straight oils or lubricant with extreme pressure additives seems to be prevailing in that field. Nevertheless, the polymer lubricant should fulfill all European standards as well as the environmental and ecological limitations with respect to health and the natural environment and its recycling and disposal. This paper is focused on the forming technology of threads and the application of selected polymers to the forming process. The measured and quantified criteria are torque and force loadings, energy consumption, and quality of the produced surfaces. Kistler dynamometers, scanning electron microscopy, and advanced surface topography with the use of Alicona IF-G5 were applied to assess all aspects of the tribological and energy aspects of six modern process fluids, three lubricating pastes, and two fluid modifications. The results show that the polymer synthetic lubricant (at volume concentration 20% in water) can reduce the total energy consumption by up to 40% per forming cycle (in mean values) at average surface roughness below 0.8 μm.

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“…The optimal process combination of 300 m high strength steel and Q460 high strength steel is obtained. Bierla A et al [8] analyzed the Tribological Mechanism of lubrication during internal thread cold extrusion, so as to optimize the lubricant formula. Pierre Stephan et al [9,10] analyzed the maximum torque value in the process of thread forming, and proposed to reduce the torque while ensuring that the threaded connection has a certain non falling off when selecting the diameter of the bottom hole.…”

Section: Introductionmentioning

confidence: 99%

Influence of Process Parameters on the Height and Performance of Magnesium Alloy AZ91D Internal Thread by Assisted Heating Extrusion

Bao

2022

Materials

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The quality of threaded connection is an important factor affecting the service life of equipment. Extruded thread has stronger mechanical properties than traditional cutting thread. The forming of magnesium alloy AZ91D internal thread by electromagnetic induction heating assisted extrusion is a new processing method. In this work, on the basis of this process, the height and performance of internal thread are selected as the evaluation index, and the response surface method is used to analyze the influence of the process parameters on the internal thread performance. The range of process parameters (auxiliary heating temperature, hole diameter, machine tool speed) is determined by slip line and empirical method, the test data are simulated, modeled and compared with the response surface analysis method, and the best mathematical model is selected to establish the regression model, the three-dimensional response surface curve of tooth height rate and maximum tensile force is obtained. Through simulation and prediction, it is found that the hole diameter and auxiliary heating temperature have significant influence on the tooth height rate and maximum tensile force of internal thread, and the order is that the hole diameter is larger than the auxiliary heating temperature than the machine tool speed. The research results show that the measured value of tooth height rate and maximum tensile force are close to the predicted value, and the errors are 1.8% and 2.7% respectively, and the model fits well. The better forming process parameters are as follows: auxiliary heating temperature to be 220 °C, hole diameter to be 11.35 mm, machine tool speed to be200 r/min. under this parameter, the tooth height rate and maximum tensile force to be 89.056% and 38.824 KN. At the same time, it is found that with the increase of thread height, the maximum tensile force of thread is also increasing, and the thread height affects the performance of thread. Finally, the optimal process parameters are obtained by response surface method, which improves the tensile properties of extruded internal threads.

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Tribological aspect of lubrication in form tapping of high‐strength steel

Cited by 15 publications

References 8 publications

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

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

Exquisite Energy Savings at Cold Metal Forming of Threads through the Application of Polymers

Influence of Process Parameters on the Height and Performance of Magnesium Alloy AZ91D Internal Thread by Assisted Heating Extrusion

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