Analytical study of maximal tapping torque during forming screw process

Stéphan, Pierre; Mathurin, Florestan; Guillot, Jean

doi:10.1016/j.jmatprotec.2010.09.013

Cited by 29 publications

(8 citation statements)

References 7 publications

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“…The simulation results were verified through experiments. Stéphan [9] used slip line theory to determine the maximum torque for a FFT during the tapping process. Huang [10] established a mathematical model to calculate the tapping force and the torque for a tool and to determine the design of parameters for tool geometry.…”

Section: Introductionmentioning

confidence: 99%

Optimization of tool geometric parameters for a small fluteless forming tap (FFT)

Jian

Hsu³

et al. 2022

Int J Adv Manuf Technol

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A small blind internal thread (SBIT) is used to firmly fasten some functional components to the cover of 3C electronic products. The small internal thread is made in a blind hole using a fluteless forming tap (FFT) that does not produce chips. However, the four geometric parameters (tool width (W), tooth root diameter (D2), front-end diameter (Df) and tooth angle (θ)) for the FFT affect the thread filling rate (f) and the minimum torque (T) for the tapping process. This study reports a Box-Behnken design (BBD) using DEFORM-3D (finite element model) and MINITAB (regression analysis) software to tap 7075-T6 aluminum alloy using a small FFT to achieve a repeatable thread filling rate and minimum torque. The experimental results show that the BBD accurately predicts and simulate the thread filling rate for tapping 7075-T6 aluminum alloy. The modelling software and the experimental design for this study can be used to optimize the design of tools that are used in industrial production.

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Section: Introductionmentioning

confidence: 99%

Optimization of tool geometric parameters for a small fluteless forming tap (FFT)

Jian

Hsu³

et al. 2022

Int J Adv Manuf Technol

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“…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. Bierla A, Fromentin G et al [8,11,12] started with the surface characteristics of cold extrusion thread, studied the geometric characteristics, surface microstructure, mechanical and metallurgical properties of the material, compared with the machined surface, proposed that the influence of lubricant and metal material strength is the two main parameters affecting the tapping process, and put forward its relationship with tapping torque.…”

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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“…In comparison with the traditional process of cutting tapping, extrusion tapping of internal thread has the follow advantages [3,4]: without chip, higher precision, better surface quality, better continuity of metallic, greater efficient, greater strength, longer tool life. Due to these distinctive principle and characteristic of internal thread forming, extrusion tapping of internal thread has caused wide research and extensive use in many industries, especially in the automotive industry [1,[5][6][7]. However, extrusion tapping of internal thread also has its defects, fabrication hard, cost high, and this process is not suitable for the materials of brittle and high hardness, inclined and thin wall threaded hole [8].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Vibration-Assisted Extrusion Tapping of Internal Thread with Finite Element Method (FEM)

Zhao

2012

AMR

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This paper firstly introduces the principle and characteristic of traditional extrusion tapping of internal thread, elaborates the material flow law during tapping process. Then puts forward a novel process of vibration-assisted extrusion tapping of internal thread, explains the effect mechanism of vibration during extrusion tapping of internal thread. Finally, with the finite element method (FEM), the simplified model of extrusion tapping are built, and the simulation of thread forming process of traditional extrusion tapping of internal thread are conducted, furthermore, the characteristic and influencing law of different vibration parameters (include vibration frequency, amplitude and direction) of vibration-assisted extrusion tapping of internal thread are studied, and some practical results are obtained. The simulation results show that applying vibration to extrusion tapping of internal thread can reduce tapping torque and improve thread forming quality, the reasonable selection of vibration parameters are very crucial to this novel process.

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Analytical study of maximal tapping torque during forming screw process

Cited by 29 publications

References 7 publications

Optimization of tool geometric parameters for a small fluteless forming tap (FFT)

Optimization of tool geometric parameters for a small fluteless forming tap (FFT)

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

Modeling and Simulation of Vibration-Assisted Extrusion Tapping of Internal Thread with Finite Element Method (FEM)

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