Study of the internal thread process with cut and form taps according to secondary characteristics of the process

Pereira, Igor Cézar; Silva, Márcio Bacci da

doi:10.1007/s00170-017-0573-x

Cited by 20 publications

(9 citation statements)

References 9 publications

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“…Pereira 19 compared the two tapping processes when applied to an aluminum alloy, in addition to other types of steels. As in this study, the torque from form tapping was greater than the torque from machine tapping.…”

Section: Discussionmentioning

confidence: 99%

Performance evaluation of tapping processes using a 7075 aluminium alloy with different cooling systems and threading heads

Coelho

Pereira

Lauro

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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Modern industry faces a great challenge: the production of consumer goods based on a triangle comprising low costs, low production time and high quality. The optimisation of modern manufacturing processes should seek not only the reduction of manufacturing time but also the reduction of mineral resources and electric energy consumption. In the context of metalworking, considering tapping processes, studies on the use of minimum quantity of lubricant are minimal and scarce. Hence, this study deals with the application of minimum quantity of lubricant and emulsion to the processes of form and machine tapping. To this end, 7075-T651 aluminium alloy workpieces were threaded using both tapping processes at three cutting/forming speeds. M10 threads with a pitch of 1.5 mm were considered the standard profile. Torque and thrust force were monitored, and three threading heads were employed in the experimental tapping tests. According to the results, it can be concluded that the best option was to use minimum quantity of lubricant in order to reduce environmental impact, given its efficient disposal of fluids and compatibility with Softsynchro threading heads, which kept both torque and axial force close to the mean values. Furthermore, this threading head model was also the best for reducing the manufacturing time of the threads.

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Section: Discussionmentioning

confidence: 99%

Performance evaluation of tapping processes using a 7075 aluminium alloy with different cooling systems and threading heads

Coelho

Pereira

Lauro

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…An experimental approach to directly measure the forces of parts of the cutting section of the tapping tool is presented in [19]. To divide and separately measure the forces acting synchronously during the process, multiple taps with ground back teeth are used.…”

Section: State Of the Artmentioning

confidence: 99%

Measuring and modelling of process forces during tapping using single tooth analogy process

Geßner¹,

Weigold²,

Abele³

2020

Prod. Eng. Res. Devel.

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For machining internal threads, tapping is a commonly used process. However, due to the complex geometry of the tapping tool, each tooth has a unique geometry resulting in individual forces. Since the forces act synchronously during the process, they partly compensate each other. However, since resulting forces in tapping can cause undesired deflection of the tool which can lead to threads that are not true to gauge or tool breakage, the knowledge of the forces is crucial. To predict the occurring forces on each tooth, different modelling approaches can be used. An approach based on the chip load-cutting force relationship is the mechanistic modelling. Therefore, a suitable force model is of central importance. An empirical force model can be established using an analogy process. Within this work a single tooth analogy process is presented to measure the forces of each tooth separately. By means of a geometrical analysis of the real tool, the chip sizes, such as the cross-section area of the undeformed chip are calculated. Merging the measured process forces from the analogy process and the actual chip sizes, an empirical force model is set up using multivariate regression. The model is validated by implementing it in an existing framework and comparing the results to experimental data.

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“…Guillaume Fromentin [10] studied the geometric characteristics and mechanical properties of cold-extruded internal threads, and the results showed that the surface quality, machining accuracy and load-bearing capacity of extruded internal threads relative to cutting threads are improved. Igor Cézar Pereira et al [11][12][13][14] analyzed the influence of the thread length, the extrusion speed and the diameter of the bottom hole of the workpiece on the thread forming process in extrusion tapping, and determined the position of the maximum torque on the tap during the extrusion process and the best extrusion speed and bottom hole diameter. The above-mentioned documents have conducted different degrees of research on the effect of the bottom hole diameter in the cold extrusion forming process of the internal thread, but there is no targeted study on the relationship between the tooth height rate and the bottom hole diameter.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Bottom Hole of Cold Extruding Internal Thread on Thread Quality

Hou

Chen²,

Zhao³

et al. 2021

mech

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The diameter of the threaded bottom hole determines whether the extrusion can proceed smoothly and the fullness of the tooth shape after extrusion. The tooth height rate is an important indicator of the strength of the threaded connection. In order to establish the relationship between the diameter of the bottom hole and the tooth height of the extruded internal thread, this paper takes the aluminum alloy M8×1.25 mm internal thread as an example, and uses a method of combining numerical simulation and process test. Obtained the changing law of internal thread profile and tooth height rate of extruded workpieces with different bottom hole diameters. Using MATLAB to fit the numerical simulation results, the relationship between the tooth height of the internal thread and the diameter of the prefabricated bottom hole of the workpiece was obtained. The reliability of the numerical simulation results and the feasibility of the fitting formula are verified through experiments. The results show that the diameter of the prefabricated bottom hole of the workpiece is controlled within 7.33~7.39 mm when the M8×1.25 mm internal thread is processed by the cold extrusion process. The high rate of the internal thread after extrusion meets the requirements of thread connection strength, and the internal thread has high forming quality and good surface quality.

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Study of the internal thread process with cut and form taps according to secondary characteristics of the process

Cited by 20 publications

References 9 publications

Performance evaluation of tapping processes using a 7075 aluminium alloy with different cooling systems and threading heads

Performance evaluation of tapping processes using a 7075 aluminium alloy with different cooling systems and threading heads

Measuring and modelling of process forces during tapping using single tooth analogy process

The Influence of the Bottom Hole of Cold Extruding Internal Thread on Thread Quality

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