scholarly journals Tool lifetime when drilling Inconel 718 in dependence of the cooling channel design –Influence of the clearance angle, the channel diameter, number, and shape

Procedia CIRP ◽  
2021 ◽  
Vol 101 ◽  
pp. 278-281
Author(s):  
Daniel Müller ◽  
Andreas Lange ◽  
Benjamin Kirsch ◽  
Jan C. Aurich
Keyword(s):  
Inconel 718 ◽  
Cooling Channel ◽  
Channel Design ◽  
Channel Diameter ◽  
Clearance Angle

scholarly journals Internal face finishing for a cooling channel using a fluid containing free abrasive grains

2021 ◽  
Author(s):  
Mitsugu Yamaguchi ◽  
Tatsuaki Furumoto ◽  
Shuuji Inagaki ◽  
Masao Tsuji ◽  
Yoshiki Ochiai ◽  
...  
Keyword(s):  
High Speed ◽  
Flow Behavior ◽  
Flow Simulation ◽  
Cooling Channel ◽  
H13 Steel ◽  
Channel Diameter ◽  
Abrasive Grains ◽  
Low Viscosity ◽  
Short Period ◽  
Internal Pressures

AbstractIn die-casting and injection molding, a conformal cooling channel is applied inside the dies and molds to reduce the cycle time. When the internal face of the channel is rough, both cooling performance and tool life are negatively affected. Many methods for finishing the internal face of such channels have been proposed. However, the effects of the channel diameter on the flow of a low-viscosity finishing media and its finishing characteristics for H13 steel have not yet been reported in the literature. This study addresses these deficiencies through the following: the fluid flow in a channel was computationally simulated; the flow behavior of abrasive grains was observed using a high-speed camera; and the internal face of the channel was finished using the flow of a fluid containing abrasive grains. The flow velocity of the fluid with the abrasive grains increases as the channel diameter decreases, and the velocity gradient is low throughout the channel. This enables reduction in the surface roughness for a short period and ensures uniform finishing in the central region of the channel; however, over polishing occurs owing to the centrifugal force generated in the entrance region, which causes the form accuracy of the channel to partially deteriorate. The outcomes of this study demonstrate that the observational finding for the finishing process is consistent with the flow simulation results. The flow simulation can be instrumental in designing channel diameters and internal pressures to ensure efficient and uniform finishing for such channels.

scholarly journals Automatic cooling channel design for injection moulds

2019 ◽  
Author(s):  
Ch. Hopmann ◽  
M. Theunissen ◽  
T. Schneppe ◽  
M. Schmitz
Keyword(s):  
Cooling Channel ◽  
Channel Design

Kühlkanalaustrittsbedingungen bei Bohrern*/Cooling channel outlet conditions for drills. Influence of the cooling channel diameter and second tool orthogonal clearance on the cooling lubricant’s efficiency

2019 ◽  
Vol 109 (01-02) ◽  
pp. 30-34
Author(s):  
D. Müller ◽  
B. Kirsch ◽  
J. C. Aurich
Keyword(s):  
Numerical Simulations ◽  
Cemented Carbide ◽  
Drilling Process ◽  
Cooling Channel ◽  
Channel Diameter ◽  
Channel Outlet ◽  
Internally Cooled ◽  
Cooling Lubricant ◽  
Cemented Carbide Drills

Die Kühlschmiereffizienz von innengekühlten Bohrern lässt sich durch eine Optimierung der Kühlkanalaustrittsbedingungen steigern. In dem Beitrag wird der Einfluss des Kühlkanaldurchmessers und des zweiten Freiwinkels auf den Bohrprozess mittels VHM (Vollhartmetall)-Wendelbohrern, welche auf Basis einer numerischen Simulation ausgelegt wurden, experimentell untersucht. Es wird gezeigt, dass im Besonderen der Kühlkanaldurchmesser einen Einfluss auf die Kühlung hat.   The cooling lubricant efficiency of internally cooled drills can be increased by optimizing the cooling channel outlet conditions. In this paper, the influence of the cooling channel diameter and the second tool orthogonal clearance on the drilling process is experimentally investigated using cemented carbide drills based on numerical simulations. It will be shown that the cooling channel diameter in particular has an influence on cooling lubrication.

Optimum Cooling Channels Design and Thermal Analysis of an Injection Moulded Plastic Part Mould

2007 ◽  
Vol 561-565 ◽  
pp. 1999-2002 ◽  
Author(s):  
Abul B.M. Saifullah ◽  
Syed H. Masood
Keyword(s):  
Cooling Time ◽  
Free Form ◽  
Cooling Channel ◽  
Channel Design ◽  
Conformal Cooling Channel ◽  
Plastic Part ◽  
Element Analysis ◽  
Conformal Cooling ◽  
Cooling Channels ◽  
Conformal Cooling Channels

Cooling channel design is important in mould designs to achieve shorter cycles, dimensional stability and reduced part stresses. Traditionally, cooling channels have been machined into mould components to avoid interference with the ejection system, coring, cavity and other mould details. Over the years straight drilled cooling channels have given away, in part, to conformal cooling technique often using free form fabrication techniques. This paper presents a study of optimised mould design with conformal cooling channel using finite element analysis. Various configurations of conformal cooling channels have been developed. The part cooling time using the conformal cooling channels and the straight cooling channels in the mould are computed using the Pro/Mechanica Thermal FEA software. Results are presented based on temperature distribution and cooling time using steady state and transient analysis conditions. The results show a reduction in cycle time for the plastic part with conformal cooling channel design.

scholarly journals Machining Accuracy Enhancement of a Machine Tool by a Cooling Channel Design for a Built-in Spindle

2020 ◽  
Vol 10 (11) ◽  
pp. 3991
Author(s):  
Kun-Ying Li ◽  
Win-Jet Luo ◽  
Shih-Jie Wei
Keyword(s):  
Machine Tool ◽  
Thermal Deformation ◽  
Simulation Analysis ◽  
Machining Accuracy ◽  
Manufacturing Cost ◽  
Cooling Channel ◽  
Channel Design ◽  
Warm Up ◽  
Maximum Decrease ◽  
Operational Time

This study presents a multiphysics simulation analysis that was performed for the cooling channel of a built-in spindle. The design of experiments (DOE) method was employed to optimize the dimension of the cooling channel, and a practical machining experiment was performed to validate the effect of the design. In terms of the temperature, pressure drop, thermal deformation, manufacturing cost, and initial cost considerations, the paralleling type cooling channel of the front bearing and the helical type cooling channel of the motor were adopted in the study. After the optimal design of the cooling channel was applied, the bearing temperature was reduced by a maximum decrease of 6.7 °C, the spindle deformation decreased from 53.8 μm to 30.9 μm, and the required operational time for attaining the steady state of the machine tool was shortened from 185.3 min to 132.6 min. For the machining validation, the spindle with the optimal cooling channel design was employed for vehicle part machining, the flatness of the finished workpiece was increased by 61.3%, and the surface roughness (Ra) was increased by 52%. According to the findings for the optimal cooling channel, when the spindle cooling efficiency is increased by the optimal cooling channel design, the thermal deformation and warm-up period can be reduced effectively, and the machining precision can be enhanced. This method is an efficient way to increase the accuracy of a machine tool.

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