Research on the Machining Methods in Machining Center

2012 ◽  
Vol 476-478 ◽  
pp. 681-685
Author(s):  
Chang Cheng
Keyword(s):  
Feed Rate ◽  
Simple Application ◽  
Machining Center ◽  
Radius Compensation

The machining center of SINUMERIK-802D system offers a large variety of machining methods. This paper compares a simplified cutter presetting method and several instructions that are less frequently used including rounding instruction (G1/G2/G3, RND), feed rate override instruction (CFC/CFTCP), helical interpolation instruction (G2/G3, TURN) and automatic input of radius compensation instruction ($TC_DP6) with other common instructions and introduces the flexible and simple application of these unfamiliar methods, in an attempt to provide some reference and inspiration for operators.

Effect of Process Parameters on Hole Diameter Accuracy in High Pressure Through Coolant Peck Drilling Using Taguchi Technique

2018 ◽  
Vol 5 (1) ◽  
pp. 12-31 ◽  
Author(s):  
Hanmant V. Shete ◽  
Madhav S. Sohani
Keyword(s):  
Feed Rate ◽  
High Performance ◽  
Manufacturing Industry ◽  
Spindle Speed ◽  
Hole Diameter ◽  
Taguchi Technique ◽  
Machining Center ◽  
Analysis Of Results ◽  
Optimal Values ◽  
Peck Drilling

Machining with pressurized coolant is nowadays widely accepted technique in the manufacturing industry, especially in high performance machining conditions. The data on the effects of variation of high coolant pressure in drilling operation is limited. This paper presents the effect of high coolant pressures along with spindle speed, feed rate and peck depth on hole diameter accuracy. Experiments were performed on EN9 steel with TiAIN coated through coolant drill on CNC vertical machining center. Taguchi technique was employed for design of experiments and analysis of results. Results showed that the higher values of optimal coolant pressure and spindle speed were demanded for drilling at bottom of hole as compared to that for drilling at top of hole. The optimal values of feed rate and peck depth were same for both the cases of drilling at top and bottom of hole. Use of high coolant pressure in drilling permits higher peck depth for better hole diameter control which results in reduced cycle time and hence production cost.

Evaluation of Face Milling Operation Parameters on Surface Roughness of Crankcase Housing by Two Level Factorial Design with Center Points

2018 ◽  
Vol 780 ◽  
pp. 105-110
Author(s):  
Ukrit Thanasuptawee ◽  
Chamrat Thakhamwang ◽  
Somsak Siwadamrongpong
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
Milling Process ◽  
Face Milling ◽  
Spindle Speed ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Significance Level ◽  
Machining Center ◽  
Semi Solid

In this study, there are three machining parameters consist of spindle speed, feed rate and depth of cut which were conducted through full factorial with four center points to determine the effect of machining parameters on the surface roughness and verify whether there is curvature in the model for CNC face milling process in an automotive components manufacturer in Thailand. The workpieces used semi-solid die casted ADC12 aluminum alloy crankcase housing which they were performed by the ARES SEIKI model R5630 3-axis CNC vertical machining center and face milling cutter with diameter of 63 millimeters. The surface roughness of face-milled was measured by the surface roughness tester. It was found that the greatest main effect influence to surface roughness was spindle speed, followed by feed rate and depth of cut at significance level of 0.05.

CNC Machining and Simulation for Relief of Special-Shaped Stone

2012 ◽  
Vol 468-471 ◽  
pp. 69-73
Author(s):  
Yu Hou Wu ◽  
Hui Jie You ◽  
De Hong Zhao ◽  
Yan Liu
Keyword(s):  
Process Parameters ◽  
Feed Rate ◽  
Tool Path ◽  
Three Dimensional ◽  
Cutting Speed ◽  
Cnc Machining ◽  
Machining Process ◽  
Cutting Depth ◽  
Machining Center ◽  
Turn Milling

Use special-shaped stone turn-milling machining center (HTM50200) to achieve the production of complex relief. Through the ArtCAM establish the three dimensional relief model of Riverside Scene at Qingming Festival. Analysis of blank material characteristics and features of NC machining center, select the appropriate tool, calculate cutting depth 、cutting speed 、feed rate 、spindle speed and other process parameters by formulas. With ArtCAM/CAM module to make process of the preparation of the rough finishing, the semi-finishing and finishing, and then generate the tool path file. Simulation in VERICUT can optimize the potential collision, over-cutting and owe cut of the machining process, and the adoption of special-shaped stone machining center for milling to finalize production of the relief, summarize the experience in special-shaped stone processing.

scholarly journals Kinematic Behaviour Modeling of the Axes of a Machining Center in High Speed Milling

2013 ◽  
Vol 698 ◽  
pp. 39-48 ◽  
Author(s):  
B. Gassara ◽  
Gilles Dessein ◽  
Maher Baili ◽  
M. Hbaieb ◽  
W. Bouzid Saï
Keyword(s):  
Cycle Time ◽  
Feed Rate ◽  
High Speed ◽  
Maximum Error ◽  
Machining Process ◽  
Machining Time ◽  
High Speed Milling ◽  
Machining Center ◽  
Kinematic Behaviour ◽  
The Cost

In the context of high speed milling HSM, the feed rate does not always reach the programmed value during the machining process which implies an increase of machining time and non compliance with the programmed feed rate. This phenomenon leads to productivity issues and an underestimation of the cost of machining for the industry. The aim of this study is to identify the kinematic behaviour of the machine tool during any type of discontinuity between linear and circular contours in different combination by taking into account the specific machining tolerances. In order to achieve this, a model of the law of the axes motion and the actual trajectory at discontinuities is necessary. This method is based on the subdividing of the trajectory into elementary geometries according to the type of interpolation (circular or linear). The proposed method can estimate the cycle time with a maximum error of 5% between the actual and the prediction cycle time. Finally, an experimental study was carried out on a high speed machine. It is based on elementary tests in order to analyze the axes behavior during any type of discontinuity and to validate the developed models.

Gloss Estimating Method of Finished Surface Machined by Ball Nose End-Milling under Constant Contact Angle with a Five-Axis Controlled Machining Center

2012 ◽  
Vol 516 ◽  
pp. 475-480
Author(s):  
Kenichi Terada ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa
Keyword(s):  
Feed Rate ◽  
End Milling ◽  
Work Piece ◽  
Machined Surface ◽  
Ball End Milling ◽  
Machining Center ◽  
Reflected Light ◽  
Finished Surface ◽  
Constant Contact Angle ◽  
Five Axis

In recent years, studies have been conducted about creating metal moulds using a five-axis controlled machining centre with ball end milling. Most of these reports concern the programming of CAM based on geometry. However, there have been few reports related to polish-less finished surface. Furthermore, a specular surface like a mirror and finishing under a constant angle between ball end milling and the work piece have not been investigated. Therefore, this paper deals with the gloss of the machined surface when feed rate and pick-feed rate are changed to maintain constant surface roughness considering tool run-out under the condition that the angle between the tool and work piece in contact are inclined at 15. However, by changing the combination of feed rate and pick-feed rate, various specular changes and direction of disposition of reflected light were obtained. Therefore, we suggest a new method of evaluating the gloss of these finished surfaces. Comparing results by the proposed method with ones by a glossmeter, it is clear that an appropriate ratio of feed rate and pick-feed rate is important for obtaining finished surface. Moreover, it is demonstrated that the proposed method is effective for estimating the gloss of the machined surface.

The Effect of Cutting Speed on the Machinability of 2080 Special K Steel on Vertical Machining Center

2014 ◽  
Vol 875-877 ◽  
pp. 1406-1411
Author(s):  
Abdullah Altın
Keyword(s):  
Surface Roughness ◽  
Cutting Force ◽  
Feed Rate ◽  
Cold Work ◽  
Cutting Speed ◽  
Milling Process ◽  
Depth Of Cut ◽  
Workpiece Material ◽  
Machining Center ◽  
Cutting Speeds

This study presents the results of machining tests carried out determine the effect of cutting forces and surface roughness on machininig of 2080 Special K (1.2080 DINX210Cr12) cold work steel in terms of cutting speed, feed rate and depth of cut for milling process. A series of experiments have been performed on 2080 Special K steel material of cutting width 50 mm with round uncoated cemented carbide insert on 5,5 Kw engine power Jhonford VMC550 CNC vertical machining center without cutting fluid. Experiments were carried out by using four different cutting speeds (70,90,110,130 m/min) at constant depth of cut (1mm) and feed rate (0,3mm/rev.) and the effects of cutting speeds on primary cutting force and surface roughness were investigated. The study of the influence of workpiece material on milling process shows that hardening of material increased by machining up. Cutting force (Fc) and surface roughness decreases with improving workpiece material machinability. From the experiments, the lowest average primary cutting force was obtained as 604,03N at cutting speed of 90m/min. The lowest average surface roughness has been obtained as 0,19 um at cutting speed 110m/min. Obtained chip form is narrow and short step.

Performance Analysis of Trihexyltetradecylphosphonium Chloride Ionic Fluid under MQL Condition in Hard turning

2020 ◽  
Vol 17 (1) ◽  
pp. 7629-7647
Author(s):  
A. Pandey ◽  
R. Kumar ◽  
A. K. Sahoo ◽  
A. Paul ◽  
A. Panda
Keyword(s):  
Material Removal Rate ◽  
Feed Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Cutting Speed ◽  
Coconut Oil ◽  
Chip Morphology ◽  
Weight Fraction ◽  
Cutting Fluid ◽  
Depth Of Cut

The current research presents an overall performance-based analysis of Trihexyltetradecylphosphonium Chloride [[CH3(CH2)5]P(Cl)(CH2)13CH3] ionic fluid mixed with organic coconut oil (OCO) during turning of hardened D2 steel. The application of cutting fluid on the cutting interface was performed through Minimum Quantity Lubrication (MQL) approach keeping an eye on the detrimental consequences of conventional flood cooling. PVD coated (TiN/TiCN/TiN) cermet tool was employed in the current experimental work. Taguchi’s L9 orthogonal array and TOPSIS are executed to analysis the influences, significance and optimum parameter settings for predefined process parameters. The prime objective of the current work is to analyze the influence of OCO based Trihexyltetradecylphosphonium Chloride ionic fluid on flank wear, surface roughness, material removal rate, and chip morphology. Better quality of finish (Ra = 0.2 to 1.82 µm) was found with 1% weight fraction but it is not sufficient to control the wear growth. Abrasion, chipping, groove wear, and catastrophic tool tip breakage are recognized as foremost tool failure mechanisms. The significance of responses have been studied with the help of probability plots, main effect plots, contour plots, and surface plots and the correlation between the input and output parameters have been analyzed using regression model. Feed rate and depth of cut are equally influenced (48.98%) the surface finish while cutting speed attributed the strongest influence (90.1%). The material removal rate is strongly prejudiced by cutting speed (69.39 %) followed by feed rate (28.94%) whereas chip reduction coefficient is strongly influenced through the depth of cut (63.4%) succeeded by feed (28.8%). TOPSIS significantly optimized the responses with 67.1 % gain in closeness coefficient.

Determination of grinding parameters of fenugreek seed

1970 ◽  
Vol 26 (1) ◽  
pp. 16 ◽  
Author(s):  
S Balasubramanian ◽  
Rajkumar Rajkumar ◽  
K K Singh
Keyword(s):  
Particle Size ◽  
Energy Consumption ◽  
Moisture Content ◽  
Specific Energy ◽  
Feed Rate ◽  
Average Particle Size ◽  
Specific Energy Consumption ◽  
Average Particle ◽  
Fenugreek Seeds ◽  
Fenugreek Seed

Experiment to identify ambient grinding conditions and energy consumed was conducted for fenugreek. Fenugreek seeds at three moisture content (5.1%, 11.5% and 17.3%, d.b.) were ground using a micro pulverizer hammer mill with different grinding screen openings (0.5, 1.0 and 1.5 mm) and feed rate (8, 16 and 24 kg h-1) at 3000 rpm. Physical properties of fenugreek seeds were also determined. Specific energy consumptions were found to decrease from 204.67 to 23.09 kJ kg-1 for increasing levels of feed rate and grinder screen openings. On the other hand specific energy consumption increased with increasing moisture content. The highest specific energy consumption was recorded for 17.3% moisture content and 8 kg h-1 feed rate with 0.5 mm screen opening. Average particle size decreased from 1.06 to 0.39 mm with increase of moisture content and grinder screen opening. It has been observed that the average particle size was minimum at 0.5 mm screen opening and 8 kg h-1 feed rate at lower moisture content. Bond’s work index and Kick’s constant were found to increase from 8.97 to 950.92 kWh kg-1 and 0.932 to 78.851 kWh kg-1 with the increase of moisture content, feed rate and grinder screen opening, respectively. Size reduction ratio and grinding effectiveness of fenugreek seed were found to decrease from 4.11 to 1.61 and 0.0118 to 0.0018 with the increase of moisture content, feed rate and grinder screen opening, respectively. The loose and compact bulk densities varied from 219.2 to 719.4 kg m-3 and 137.3 to 736.2 kg m-3, respectively.  

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