scholarly journals Analysis of improving ways for dual nozzle negative pressure chip removal device in deep hole processing

2019 ◽  
Vol 1168 ◽  
pp. 022087
Author(s):  
Guo Zhenhao ◽  
Guan Shixi ◽  
Guan Bo ◽  
Chang Jing ◽  
Liu Ya
Keyword(s):  
Negative Pressure ◽  
Deep Hole ◽  
Chip Removal

Deep-Hole Drilling Negative Pressure Device Injection Process Simulation Analysis Based on Fluent

2014 ◽  
Vol 602-605 ◽  
pp. 680-683
Author(s):  
Zhen Ya Chen ◽  
Xing Quan Shen ◽  
Zhi Jie Xin
Keyword(s):  
Negative Pressure ◽  
Area Ratio ◽  
Cutting Fluid ◽  
Sectional Area ◽  
Deep Hole ◽  
Cross Sectional ◽  
Injection Process ◽  
Injection Coefficient ◽  
Discharge Pressure ◽  
Chip Removal

In the process of DF system machining the small diameter deep hole, the working parameters of negative pressure device has a great influence, including injection coefficient, chip removal of cross-sectional area ratio, discharge pressure, negative pressure number, etc. Injection coefficient has the non-linear proportional relationship with chip removal of cross-sectional area ratio, with the increasing incidence of negative pressure discharge pressure increases, as well as, increasing negative pressure number to improve chip removal have a good effect. Movement patterns of cutting fluid is simulated, energy loss of cutting fluid in the flow is studied, finding curved edge nozzle has better negative effects than straight edge nozzle. The effect of negative pressure pumping crumbs is analyzed, the injection process of negative pressure device is simulated, and the form of the fluid motion in negative pressure nozzle is got based on Fluent, which have a good guide for the actual production and machining.

scholarly journals Research on chip removal mechanism of pulse fluid negative pressure in deep hole machining

2021 ◽  
Vol 1748 ◽  
pp. 062014
Author(s):  
Xiao Zhang ◽  
Zhen Dong ◽  
Zhi Bing Zhang ◽  
Fang Ping Yao
Keyword(s):  
Negative Pressure ◽  
Deep Hole ◽  
Removal Mechanism ◽  
On Chip ◽  
Hole Machining ◽  
Chip Removal

Design and Simulation Analysis of Low Temperature Air Deep Hole Processing System

2014 ◽  
Vol 620 ◽  
pp. 154-159
Author(s):  
Hai Peng ◽  
Qiang Wang
Keyword(s):  
Low Temperature ◽  
Flow Rate ◽  
Pressure Difference ◽  
Gas Flow ◽  
Simulation Analysis ◽  
Processing System ◽  
Deep Hole ◽  
Machining System ◽  
Hole Machining ◽  
Chip Removal

In this paper, a unique design of low temperature of BTA deep-hole machining system based on the green manufacturing was proposed,in which the low temperature air cutting technology was applied to the BTA deep hole processing. Consequently, the system have the characteristics of low temperature air cutting and deep hole processing. The system presented here uses the large flow of cold air (-30 °C ~-20 °C) and oil mixing atomization gas (MQL) for chip removal, cooling and lubricating the tool, thus the use of deep hole cutting oil was decreased, the cooling and lubricating effect of the tool was strengthened and the tool life was also strengthened. In this article, the ANSYS CFX was used for simulating the internal flow field of chip removal channel. By means of simulations, it is concluded that the pressure difference between the low temperature cold wind is significantly greater than the pressure difference between the liquid, and the gas flow rate is greater than the liquid flow rate. The comprehensive analysis indicate that low temperature air system are likely to bring about a better ability of chip removal, which provides theoretical basis for the low temperature air cutting technology was applied to deep-hole machining system.

Study on Chip-Breaking Technology for Numerical-Control Varying-Feed Drilling of Deep Hole

2012 ◽  
Vol 217-219 ◽  
pp. 2688-2691
Author(s):  
Qing Yan Ma ◽  
Biao Wang ◽  
Da Guo Yu
Keyword(s):  
Small Diameter ◽  
Numerical Control ◽  
Drilling Process ◽  
Deep Hole ◽  
Chip Breaking ◽  
Chip Size ◽  
Breaking Mechanism ◽  
On Chip ◽  
Pressure Suction ◽  
Chip Removal

In the drilling process for deep hole, the continuous chips often jam up due to the difficulty of chip removal, and the chips cause problems such as tool breakage and deterioration of the surface quality. The measures of chip removal must be adopted, especially for small diameter deep hole, the chip removal space is limited and thickness and length of chips can directly influence the chip removal, the chip size are required as a precondition for chip removal. In this study, the feed is periodically varied in numerical control machine, and the length of chip can be controlled, then the chip breaking is realized with no addition special chip breaking mechanism, which combines with negative pressure suction mechanism for chips, and solves the problem of chip breaking and removal.

Optimization Design and Simulation of Negative-Pressure Removing-Chip Mechanism of Deep Hole

2012 ◽  
Vol 215-216 ◽  
pp. 105-110 ◽  
Author(s):  
Biao Wang ◽  
Li Qin Zhao ◽  
Qing Yan Ma
Keyword(s):  
Negative Pressure ◽  
Optimization Design ◽  
Pressure Effect ◽  
Influence Factors ◽  
Hole Drilling ◽  
Hydraulic Pressure ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Injection Angle

In the deep-hole drilling process, chips can not be easily removed, so the influence factors of the negative-pressure removing-chips were analyzed on the existing DF negative-pressure removing-chip mechanism by the hydraulic pressure theory and the injection angle κ and negative pressure gap S were analyzed with FLUENT software. The results show that negative pressure effect were best in 32°of κ and 0.4 mm of S and negative pressure effect are better in 28°of κ and 0.5mm of S , which lay good theoretical foundation for the optimization and characteristics of negative pressure mechanism in near-dry deep-hole drilling.

A Novel Approach to the Design of Self-Piloting Drills With External Chip Removal, Part 2: Bottom Clearance Topology and Experimental Results

1995 ◽  
Vol 117 (4) ◽  
pp. 464-474 ◽  
Author(s):  
V. P. Astakhov ◽  
V. V. Galitsky ◽  
M. O. M. Osman
Keyword(s):  
Pressure Distribution ◽  
Continuous Monitoring ◽  
Coolant Flow ◽  
Experimental Comparison ◽  
Hole Drilling ◽  
Experimental Investigations ◽  
Deep Hole ◽  
Novel Approach ◽  
Chip Removal ◽  
Made In

In the first part of this paper, geometrical relations were formulated to describe the geometry of a self-piloting drill with external chip removal. A novel approach to the design of the cutting tip was proposed and an experimental comparison between conventional and newly designed drills was made. In deep hole drilling, after the tool and the machine, the most important component is the coolant. It is important that the coolant be distributed uniformly within the machining zone to improve chip removal, lubrication and cooling. Thus, in this paper, the coolant flow in the limited space between the drill flanks and the bottom of the hole being drilled (called “bottom clearance”) is emphasized. Experimental investigations were done by using a specially designed workpiece which enables continuous monitoring of coolant flow and pressure distribution in the machining zone. The investigation shows that the newly designed drill is characterized by a significantly better coolant distribution in the bottom clearance resulting in an increase in tool life and better chip removal conditions.

Designing operations for deep hole drilling of small diameters with an internal chip removal tool

2020 ◽  
pp. 12-23
Author(s):  
Yuri I. Kizhnyaev ◽  
Boris Anatol’evich Nemtsev ◽  
Pavel Dmitrievich Yakovlev ◽  
Sergey Pavlovich Yakovlev
Keyword(s):  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Chip Removal
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