BTA Deep Hole Vibration Drilling for Nickel-Based Alloys: Cooling Patterns and Cutter Tooth Wear Mechanisms

Shi, Yuhua; Zheng, Jianming; Feng, Pingfa; Shang, Pengjian; Liu, Chi; Chen, Ting; Shan, Shijie

doi:10.3390/ma15228178

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…The most important parameters are rotational speed, torque, and contact force. The correct choice of parameters depends on the strength of the drilled material, the diameter of the drilled hole, and the force exerted in the process of the hole-drilling [3][4][5]. The correct selection of parameters with optimal settings can be monitored in real time by a suitably selected sensor involved in the drilling process [6,7].…”

Section: State Of the Artmentioning

confidence: 99%

Influence of Coolant Properties and Chip Former Geometry on Tool Life in Deep Drilling

Kočiško,

Pollák,

Grozav

et al. 2023

Applied Sciences

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The aim of the article is to find a correlation between a change in the properties of the cooling agent and a change in the geometry of the chipformer, as both are reflected in the service life of the tool after deep drilling. The reason for carrying out the research is the requirement of practice to obtain the economic efficiency of the production of such a demanding process as deep drilling. When applying the latest designs of gun drills, it is very important to correctly set the technological parameters to maintain the stability of the cutting process. One of the most important parameters is the correct removal of heat from the cutting site, and this will be ensured by the stability of pressure, temperature, and percentage of emulsion in the cooling medium, as well as the adjustment of the geometry of the chip former. On this basis, a large number of tests were carried out, consisting of testing the number of drilling cycles carried out by new, unfluted gun drills at constant feed rates and spindle rotation frequencies. After testing, it is possible to modify and supplement the existing methodology of deep drilling technology in terms of managing the cooling emulsion and chip-forming geometry. The tests were aimed at increasing the service life and the number of possible re-grindings of the gun drills depending on changes in the percentage of the emulsion concentration, the pressure and temperature of the cooling agent, and the associated chipformer geometry.

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Section: State Of the Artmentioning

confidence: 99%

Influence of Coolant Properties and Chip Former Geometry on Tool Life in Deep Drilling

Kočiško,

Pollák,

Grozav

et al. 2023

Applied Sciences

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“…However, the depth-todiameter ratio of deep holes in nuclear power tube plates exceeds 45, and it also requires high values for the surface quality and the machining accuracy. As a result, the quality of the deep-hole drilling of the nuclear tube plate often fails to meet the standard, which causes the hole processing of the tube plate to become a bottleneck in the manufacture of the main equipment used in nuclear power [13,14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Tool Wear and Machining Quality of BTA Deep-Hole Drilling in Low-Carbon Alloy Steel SA-5083

Li,

Zhai,

et al. 2023

Materials

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Nuclear power tube plates are made from the high-strength, low-carbon alloy steel SA-5083, which has high values of toughness and plasticity, though it is forged with poor consistency and entails serious work hardening. It requires a large number of deep holes with a high machining accuracy and high surface quality to be processed. However, the quality of the processed holes is often not up to the standard of the Boring and Trepanning Association (BTA) for the deep-hole drilling of tube plates; this has led to deep-hole processing becoming a bottleneck in the manufacture of steam generators for the main equipment of nuclear power islands. The variation laws of the diameter, roundness, perpendicularity, roughness, microhardness, and residual stress in relation to the feed, speed, and drilling depth are explored in the macro- and micro-dimensions; also explored is the wear morphology of BTA drills. The internal influence mechanisms between them are revealed in order to provide a scientific basis for the control of surface quality and machining accuracy as well as the optimization of process parameters. Our research results indicate that the guide block wear is mainly concentrated at the top 1–2 mm and that the drilling depth and feed have a great influence on the machining diameter. The hole wall roughness is between 0.3 and 0.6 μm, the maximum microhardness is about 2.15 times the hardness of the matrix material, and the residual stress is compressive stress. With increases in the feed and drilling depth, the hole diameter and the roughness increase. With an increase in the speed, the roughness decreases and the compressive stress of the BTA deep-hole drilling wall increases.

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Advanced Machining Technology for Modern Engineering Materials

Karmiris-Obratanski,

Thangaraj,

Leszczyńska-Madej

et al. 2024

Materials

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BTA Deep Hole Vibration Drilling for Nickel-Based Alloys: Cooling Patterns and Cutter Tooth Wear Mechanisms

Cited by 3 publications

References 31 publications

Influence of Coolant Properties and Chip Former Geometry on Tool Life in Deep Drilling

Influence of Coolant Properties and Chip Former Geometry on Tool Life in Deep Drilling

Experimental Investigation of Tool Wear and Machining Quality of BTA Deep-Hole Drilling in Low-Carbon Alloy Steel SA-5083

Advanced Machining Technology for Modern Engineering Materials

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