Modeling and Distribution Laws of Drilling Force for Staggered Teeth BTA Deep Hole Drill

Li, Xubo; Zheng, Jianming; Li, Yan; Kong, Lingfei; Shi, Weichao; Guo, Bingbing

doi:10.1155/2018/3691468

Cited by 11 publications

(8 citation statements)

References 27 publications

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“…It is known that the initial mass of the human tooth is between 0.51 grams and 2.28 grams [19] and the mass depends on many factors: oldness of the person, type of the tooth, depth of the root etc. The drill diameter is in the interval 1-5 mm, the drilling velocity is in the interval of 13-15 m/min and the suggested feed rate for tooth drilling is 0.005-0.06 mm/rev [7]. Assuming the numerical data D=2 mm, fr= 0.05 mm/rev, m0=1.32 g, v=15 m/min, the mass variation is = 1.32 − 0.002 .…”

Section: Discussionmentioning

confidence: 99%

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Effect of Mass Variation on Vibration Properties of the Tooth in Drilling Operation

Cvetićanin

Vujkov

2021

Preprint

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Dental cavity represent one of the widespread illness of the tooth. Method for treating of the tooth is to drill the cavity and to fill the hole with suitable material. Measurements show that during drilling the tooth vibrates with increasing mass that causes unpleasant feeling for patient. The aim of the paper is to give the theoretical explanation for this phenomena and to give suggestion for vibration elimination. During drilling, mass of the tooth is decreasing and the so called ‘reactive force’ occurs. Drilling and reactive force cause tooth vibration. The system is modeled as a nonlinear time variable system. An analytical procedure for solving of the equation of vibration is developed. The solution is assumed in the form of the generalized trigonometric function with time variable amplitude and phase. It is obtained that not only the amplitude but also the frequency of tooth vibration in drilling are increased. In addition to reactive force the drilling velocity, diameter of the drill tool and spindle speed affect the vibration level. The appropriate values of these parameters would eliminate or decrease the patient bad feeling.

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Section: Discussionmentioning

confidence: 99%

“…Diameter of the hole and feed rate determine the drilling force. Distribution of the measured drilling force along the cutting radius is presented in [7]. It is concluded that the force directly affect the stability of the operation and the quality of machined hole.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mass Variation on Vibration Properties of the Tooth in Drilling Operation

Cvetićanin

Vujkov

2021

Preprint

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“…The geometric parameters of the BTA drill have an important influence on deep-hole drilling; the geometric parameters of the BTA drill are selected as follows. The value of rake angle of the BTA drill depends on the material property and processing requirements [34]. Due to the small plastic deformation and high chemical activity of TA10, the contact length between the rake face and the chip is small, the cutting stress and cutting temperature are relatively concentrated, and the hardened layer is easily produced on the rake face; so, a smaller rake angle should be used to strengthen the edge strength and increase the contact area between the chip and the rake face.…”

Section: Structure Of the Toolmentioning

confidence: 99%

Multiobjective Optimization of Cutting Parameters for TA10 Alloy Deep-Hole Drilling

et al. 2022

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In order to obtain better quality TA10 pipes, the Boring and Trepanning Association (BTA) deep-hole drilling process is used. However, this type of machining leads to difficult chip removal, tool wear, and poor hole-surface quality. In this study, a deep-hole drilling experiment was conducted on TA10 workpieces using the designed tool with different process parameters, and the process parameters were optimized by machining results with multiple objectives such as chip morphologies, tool wear, hole-axis deflection, and hole surface roughness. The results show that different process parameters have a great impact on the cutting process, with a higher feed resulting in smoother chip removal and a lower spindle speed resulting in lighter tool wear and less hole axis deflection. When the spindle speed is 145 r/min and the feed is 0.12 mm/r, the machined TA10 pipe meets both the accuracy requirement of roughness and the machining efficiency.

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Section: Introductionmentioning

confidence: 99%

“…BTA drilling is one of primary machining types which are used to produce deep holes (Yang et al , 2018; Li et al , 2019). BTA stands for Boring and Trepanning Association (Thil et al , 2013), and Figure 1 from Sandvik Coromant shows BTA drilling (Li et al , 2020; Li et al , 2019). The BTA drilling tool is threaded onto the drill tube (Yu, 2016); and the coolant(oil) indicated by arrows in Figure 1 flows through the gap between the deep hole and the drill tube to the drilling tool, then drives chips past the hole in the drilling tool and drill tube to the right box and the coolant tank (Figure 1) (Ma and Shen, 2018a, 2018b, 2017).…”

Section: Introductionmentioning

confidence: 99%

Centering deep hole drilling system with three oil films like centering rotating journal with oil films in bearing

Ming

2021

ILT

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Purpose This study and its centering device with Archimedes spirals designed on hydrodynamic lubrication aims to reduce the deviation of deep holes because the drill tube is long and easy to deviate in deep hole machining. Design/methodology/approach The centering device with Archimedes spirals was designed and fixed between the drilling tool and the drill tube. The wall of the deep hole and the novel centering device formed three wedge-shaped oil films. When the workpiece rotated relative to the centering device, pressure was generated in the oil films; therefore, three oil films supported drilling system as oil films support rotating journal in the full-film hydrodynamic bearing. Findings When the Boring and Trepanning Association (BTA) drilling system was equipped with the centering device, the cutting oil flowed smoothly and carried all the iron chips; the motors run normally; no additional vibration or sound was detected during processing; the surface of the centering device was smooth; and the deviation of the drilled deep hole decreased with a high probability. Originality/value To the best of the authors’ knowledge, no one has designed and made the centering device with Archimedes spirals to reduce the deviation of deep holes in deep hole machining. Three oil films formed by the centering device with Archimedes spirals support drilling system and prevent it from deviating, which has never appeared before and is creative.

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Modeling and Distribution Laws of Drilling Force for Staggered Teeth BTA Deep Hole Drill

Cited by 11 publications

References 27 publications

Effect of Mass Variation on Vibration Properties of the Tooth in Drilling Operation

Effect of Mass Variation on Vibration Properties of the Tooth in Drilling Operation

Multiobjective Optimization of Cutting Parameters for TA10 Alloy Deep-Hole Drilling

Centering deep hole drilling system with three oil films like centering rotating journal with oil films in bearing

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