Experimental study of forming and tightening processes with thread forming screws

Stéphan, Pierre; Mathurin, Florestan; Guillot, Jean

doi:10.1016/j.jmatprotec.2011.10.029

Cited by 30 publications

(7 citation statements)

References 7 publications

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“…The study used an ISO standard screw formula to calculate the empirical formula for the torque when the tap presses. Stéphan et al [9] used a slip-line method to determine the pressure on the ank of the thread and described the physical displacement of the extruded material during the tapping process. Carvalho et al [10] studied the effect of different coatings on tools, the smaller hole diameter and feed rate on the torsion force, the axial force, the hardness and the thread lling rate during the formation of an extrusion thread.…”

Section: Introductionmentioning

confidence: 99%

Study on micro-forming taps with unequal fluteless spacing

Chen²,

Huang³

et al. 2023

Int J Adv Manuf Technol

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Tools with unequal uteless spacing (UFS) feature are used to cut different materials. The UFS tool and a traditional tool differ in terms of the angle between the two cutting edges. The UFS tool experiences smaller axial and radial cutting forces than the traditional tool so cutting vibration is reduced, tool life is increased and the surface roughness of the workpiece increases. This study uses the smaller hole diameter (D), spindle speed (N) and cutting uid concentration (C) for the central composite design (CCD). MINITAB statistical software is used for the second-order response surface modeling of the maximum thread lling rate (f) and the minimum torque (T) for micro-forming M1.2 mm taps using UFS on AL-7075 aluminum alloy. The analysis of variance (ANOVA) results for f and T show that D and C are the important parameters that affect f , and D, N and C signi cantly affect T. Compared with the predicted conditions, the errors in f and T for the experiment are 2.51% and 2.25%, respectively. This study shows that the two second-order mathematical models that are derived using CCD and the response surface method (RSM) feature good prediction accuracy.

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Section: Introductionmentioning

confidence: 99%

Study on micro-forming taps with unequal fluteless spacing

Chen²,

Huang³

et al. 2023

Int J Adv Manuf Technol

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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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“…The accurate mate of the bolt-hole thread is the premise to complete the bolt fastening after hole positioning. The improper initial mating most often occurs cross threading or jamming [21]. Most researchers focus on bolt alignment in automatic fastening.…”

Section: Introductionmentioning

confidence: 99%

A Bolt Assembly Robotic System Based on Hybrid Vision: Effect of its Process Parameters on Fastening Performance

Chen

Liu

et al. 2022

Preprint

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Bolt assembly is very common in modern manufacturing. With the improvement of industrial automation levels, the demand for automatic assembly increases. However, the robotic automation still suffers from various impracticalities. In this work, to improve the environment adaptability and reduce the system cost, a robotic system based on hybrid vision is presented for the bolt assembly, which is composed of a 6-DOF robot, a hybrid vision and an electric fastening tool. In the hybrid vision, a scene monocular vision and a hand-eye monocular vision are combined to obtain the accurate pose of the hole. Besides, motion parameters of the robotic system, including the end-effector linear speed of the manipulator, the rotation speed of the tool, have the major impact on the assembly efficiency and quality. For this problem, the effect of the combined changes in robotic motion parameters on the bolt fastening efficiency and quality was studied based on experimental data. The efficiency and quality were evaluated by the speed of the bolt screwed in and the combination of standard deviation and average value of the torque variation, respectively. Results can provide proper values for motion parameters of the robotic system through considering requirements of the actual bolt assembly.

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Experimental study of forming and tightening processes with thread forming screws

Cited by 30 publications

References 7 publications

Study on micro-forming taps with unequal fluteless spacing

Study on micro-forming taps with unequal fluteless spacing

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

A Bolt Assembly Robotic System Based on Hybrid Vision: Effect of its Process Parameters on Fastening Performance

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