Analysis of burr formation in form tapping in 7075 aluminum alloy

Filho, Sérgio Luiz Moni Ribeiro; Oliveira, Juliano Aparecido de; Arruda, Étory Madrilles; Brandão, Lincoln Cardoso

doi:10.1007/s00170-015-7768-9

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…In practical application, the lowest recrystallization temperature is shown in Formula (1). 15 The melting point of magnesium alloy AZ91D is 596°C, and its lowest recrystallization temperature is 208.6°C-238.4°C.…”

Section: Auxiliary Heating Temperaturementioning

confidence: 99%

“…The complex unknown function relationship is used in a simple first or quadratic polynomial model in a small region to fit the functional relationship between factors and response values. 15 Through the analysis of the regression equation to find the optimal process parameters, a statistical method to solve the multivariable problem. Compared with the orthogonal experiment, its advantage is that it can analyze all levels of the experiment continuously and reflect the optimal value of dependent variables more intuitively, while the orthogonal experiment is only based on the design of linear model.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of process parameters for electromagnetic induction heating assisted extrusion of magnesium alloy AZ91D internal thread

Fan

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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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 torque in the forming process is selected as the evaluation index, and the response surface method is used to analyze the influence of the process parameters on the internal thread forming process. 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 torque is obtained. Through simulation and prediction, it is found that the hole diameter and auxiliary heating temperature have significant influence on the torque in the forming process, and the order is that the hole diameter is larger than the auxiliary heating temperature than the machine tool speed. At the same time, it is found that the interaction between the auxiliary heating temperature and the machine tool speed has a significant effect on the torque. The research results show that the measured value of torque is close to the predicted value, and the predicted value is 3.1% lower than the actual value, and the model fits well. The better forming process parameters are as follows: auxiliary heating temperature to be 240°C, hole diameter to be 11.45 mm, machine tool speed to be 100 r/min. under this parameter, the torque in the forming process to be 24.751 N·m.

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Section: Auxiliary Heating Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of process parameters for electromagnetic induction heating assisted extrusion of magnesium alloy AZ91D internal thread

Fan

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…They used a sophisticated statistical analysis to determine the impact of the key factors on the thrust force, torque, and connection of these factors with microhardness and thread profile quality. Burr development during the form tapping process was investigated by Filho et al [14]. With uncoated and coated taps, internal threads in workpieces made of the 7075-aluminum alloy were completed, and the burr formation at the entrance and exit was examined.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the surface integrity characteristics of internal threads machined on lead-free brass alloy

ZOGHIPOUR¹

2023

Materials Research Proceedings

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Abstract. Tapping is a typical machining method being utilized in manufacturing internal threads. However, it contains few difficulties to be dealt with since during the process, many cutting edges involve synchronized axial and rotational movements. This work presents the results of an experimental study on the material type considering the influences of the manufacturing process (extrusion and forging) and tap type on the surface integrity characteristics of lead-free brass alloys. Experimental data on the surface quality of the threads, subsurface characteristics including microhardness is presented and analyzed. This study demonstrates that the manufacturing methods have a robust effect on microstructural aspects of low-lead brass alloy and resulting in hardening of the surface and subsurface.

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“…Pereira I C et al [14] studied the effects of thread length, tool coating, feed speed and bottom hole diameter on the cold extrusion process of internal thread, and obtained the optimal values of the above parameters. Luiz M et al [15] took 7075 aluminum alloy as an example to study the forming of workpiece burr during tapping, and pointed out that the burr in the front part of the workpiece is mainly caused by the diameter of bottom hole, and the biggest influencing factor of burr at the end of the workpiece is the tapping speed. Carvalho et al [16] studied the effects of hole diameter, extrusion speed and tool type on torque, material hardness, filling rate and thrust response during tapping.…”

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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Analysis of burr formation in form tapping in 7075 aluminum alloy

Cited by 7 publications

References 13 publications

Optimization of process parameters for electromagnetic induction heating assisted extrusion of magnesium alloy AZ91D internal thread

Optimization of process parameters for electromagnetic induction heating assisted extrusion of magnesium alloy AZ91D internal thread

Evaluation of the surface integrity characteristics of internal threads machined on lead-free brass alloy

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

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