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

2021 ◽  
Vol 73 (6) ◽  
pp. 993-999
Author(s):  
Daguo Yu ◽  
Ming Zhao
Keyword(s):  
Hydrodynamic Lubrication ◽  
Hole Drilling ◽  
The Novel ◽  
Deep Hole ◽  
Drilling Tool ◽  
Content Type ◽  
Hydrodynamic Bearing ◽  
Drilling System ◽  
Oil Films ◽  
Hole Machining

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.

Design and Research of Amplitude Transformer in Ultrasonic Vibration Drilling System

2010 ◽  
Vol 139-141 ◽  
pp. 852-856
Author(s):  
Zhan Feng Liu ◽  
Ya Zhou Feng
Keyword(s):  
Ultrasonic Vibration ◽  
Small Diameter ◽  
Hole Drilling ◽  
Deep Hole ◽  
Sound System ◽  
Design And Manufacturing ◽  
Drilling System ◽  
Vibration Drilling ◽  
Hole Machining ◽  
Sound Vibration

The ultrasonic vibration drilling presents superior technology effect than common methods in small-diameter deep hole machining areas, and can improve the machining quality and efficiency remarkably. The amplitude transformer usually is designed by users according to the requirement of production. Thus the design and manufacturing of amplitude transformer and the realization of the resonance of device are key problems in ultrasonic vibration drilling system. In this paper, we firstly analyzed the structure of amplitude transformer in the axial ultrasonic vibration drilling, and then designed and manufactured the composite amplitude transformer for small-diameter deep holes in the ultrasonic vibration drilling. After we carried out the test in the sound vibration system, the result indicated that the resonance of the sound system could be satisfied and the demand of small-diameter deep hole drilling could be met.

Guidance principle of deep-hole cutting tools based on fluid wedge effect

2017 ◽  
Vol 231 (14) ◽  
pp. 2585-2595
Author(s):  
Daguo Yu ◽  
Rongtao Zhang ◽  
Ruixuan Li
Keyword(s):  
Cutting Tool ◽  
Hydrodynamic Lubrication ◽  
Cutting Tools ◽  
Resultant Force ◽  
The Novel ◽  
Deep Hole ◽  
Oil Film ◽  
Shaped Body ◽  
Oil Films ◽  
Wedge Effect

The existing guidance principle of deep-hole cutting tools has been used for more than 200 years. A novel guidance principle of deep-hole cutting tools is proposed based on the fluid wedge effect. The novel guidance principle stems from hydrodynamic lubrication in journal bearings and can prevent deep-hole cutting tool deviation during machining. A novel wedge-shaped body is fixed to the drill tip and the shank. The wedge-shaped body and the wall of the deep hole form four wedge-shaped spaces, and the cutting oil is drawn into the four wedge-shaped spaces to form four wedge-shaped oil films. Pressure develops in the oil film, and the forces of the oil films force the wedge-shaped body together with the drill tip and the shank to be centered in the deep hole and to move along the axis of the deep hole. The resultant force of the oil films tends to rectify the deviation of the cutting tool, and the resultant force equals 228 N in one example. Analysis and calculation of the forces of the wedge-shaped oil films were conducted, and the force of each oil film was 128 N in another example. Experiments showed that the average straightness of the deep holes machined by the novel deep-hole cutting tools was less than that achieved using the existing cutting tool. The parameters of the wedge-shaped body influenced the force of the oil film and the straightness of the deep holes.

scholarly journals Process-parallel center deviation measurement of a BTA deep-hole drilling tool

2018 ◽  
Vol 24 ◽  
pp. 229-234 ◽  
Author(s):  
Berend Denkena ◽  
Benjamin Bergmann ◽  
Sebastian Kaiser ◽  
Markus Mücke ◽  
Dieter Bolle
Keyword(s):  
Hole Drilling ◽  
Deep Hole ◽  
Drilling Tool ◽  
Deep Hole Drilling ◽  
Deviation Measurement

A Study on the Monitoring Technology of Extra-Large Deep Hole Drilling Using the Tilt Sensor

2009 ◽  
Vol 626-627 ◽  
pp. 483-488
Author(s):  
Nam Hun Kim ◽  
Il Sik Shin ◽  
Jeong Woo Park
Keyword(s):  
Surface Roughness ◽  
Control System ◽  
Real Time ◽  
Common Rail ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Fuel Supply ◽  
Drilling System ◽  
Tilt Sensor

This study is on the configuration of deep hole drilling system for machining of extra-large common rail fuel supply pipes. Machining conditions for deep hole drilling were deduced and stability of the developed system was verified through measurement of machining surface roughness. Also, a tilt sensor was used for real-time monitoring on machining of deep hole drilling. Machining state was evaluated through composition of a control system for signal feedback.

A Study on the Characteristics of Micro Deep Hole Machining Processes

2007 ◽  
Vol 364-366 ◽  
pp. 566-571
Author(s):  
Tae Il Seo ◽  
Dong Woo Kim ◽  
Myeong Woo Cho ◽  
Eung Sug Lee
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
High Speed ◽  
Printed Circuit Boards ◽  
Hole Drilling ◽  
Deep Hole ◽  
Machining Processes ◽  
Deep Hole Drilling ◽  
Micro Drilling ◽  
Hole Machining

Recently, the trends of industrial products move towards more miniaturization, variety and mass production. Micro drilling which take high precision in cutting work is required to perform more micro hole and high speed working. Especially, Micro deep hole drilling is becoming more important in a wide spectrum of precision production industries, ranging from the production of automotive fuel injection nozzle, watch and camera parts, medical needles, and thick multilayered Printed Circuit Boards(PCB) that are demanded for very high density electric circuitry. The industries of precision production require smaller holes, high aspect ratio and high speed working for micro deep hole drilling. However the undesirable characteristics of micro drilling is the small signal to noise ratios, wandering motion of drill, high aspect ratio and the increase of cutting force as cutting depth increases. In order to optimize cutting conditions, an experimental study on the characteristics of micro deep hole machining processes using a tool dynamometer was carried out. And additionally, microscope with built-in an inspection monitor showed the relationship between burr in workpieces and chip form of micro drill machining.

MQL Technology Including the BTA Deep Hole Drilling Machining

2011 ◽  
Vol 189-193 ◽  
pp. 3071-3074
Author(s):  
Hai Peng ◽  
Tong Li
Keyword(s):  
Processing System ◽  
Water Soluble ◽  
Production Costs ◽  
Cutting Fluid ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Mixed Use ◽  
High Production ◽  
Hole Machining

The traditional cast-type method of BTA deep-hole drilling(such as BTA or DF) has cutting fluid consumption of the existence of large, high production costs, pollution of the environment and endangering the health of the operator and other problems. In this paper, the MQL technology (minimum lubrication technology) is applied to the method of BTA deep-hole machining (ie, near-dry deep-hole processing), we also analyzed the function and effect of MQL machining cutting fluid. Through the near-dry deep-hole drilling experiment, we find that a water-soluble cutting fluid has good atomization effect and the processing system also has fine effect of cooling and chip evacuation. We proposed mixed-use oil and the low-temperature cold spray methods to improve the tool lubrication and cooling effect for some great issues such as tool wear.

The Experimental Research on Small Hole Machining in Glass Using Diamond Abrasive Core-Tools

2009 ◽  
Vol 76-78 ◽  
pp. 491-496 ◽  
Author(s):  
Yan Ming Quan ◽  
Liang Liang ◽  
Wen Wang Zhong
Keyword(s):  
Small Hole ◽  
Experimental Result ◽  
Hole Drilling ◽  
Sintering Process ◽  
Machine Material ◽  
Drilling Tool ◽  
Hard Materials ◽  
Hard And Brittle Material ◽  
Hole Machining ◽  
Diamond Abrasive

Glass is a kind of difficult-to-machine material due to its hard and brittle properties. Although many special hole machining methods for brittle and hard materials have been developed, the traditional drilling is still widely applied because it is simple and reliable. However, the drilling tool for hard and brittle material is an obstacle, especially for small hole drilling. In this paper, two types of diamond abrasive core-tools which are made by electroplating and sintering process are used to machine small holes in glass plates, their structures are introduced and their machining performances are compared. The experimental result indicates that these diamond abrasive tools are satisfied for small hole machining in glass, and the performance of electroplating tool is better than that of sintering one.

Experiments and Analysis of Near-Dry Deep-Hole Drilling System

2010 ◽  
Vol 455 ◽  
pp. 355-359
Author(s):  
Peng Hai ◽  
F. Yuan
Keyword(s):  
Design Method ◽  
Processing System ◽  
Cutting Parameters ◽  
Hole Drilling ◽  
Deep Hole ◽  
Dry Cutting ◽  
Deep Hole Drilling ◽  
Drilling System ◽  
Better Than

Based on the characteristics of near-dry cutting and BTA deep-hole drilling, this paper presented design method of near-dry deep-hole processing system, and then studied on it through experiments. The results show that the near-dry deep-hole processing system has better effects on discharge chips and coolant. At the same time, near-dry cutting function was better than BTA cutting with appropriate cutting parameters through comparing with BTA cutting machining.

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