Wear of replaceable indexable inserts made of mixed cutting ceramics CC650 as a function of force parameters of steel ShKh15 face milling

2015 ◽  
Vol 36 (6) ◽  
pp. 521-527 ◽  
Author(s):  
S. N. Grigoriev ◽  
M. A. Volosova ◽  
V. L. Gurin ◽  
A. E. Seleznev
Keyword(s):  
Face Milling ◽  
Steel Shkh15 ◽  
Cutting Ceramics

Studi implementasi cad/cam pada proses milling cnc terhadap kekasaran permukaan dan tingkat kepresisian aluminium 6061

2018 ◽  
Vol 11 (1) ◽  
pp. 36
Author(s):  
Risdiyanto Edy Saputro ◽  
Indri Yaningsih ◽  
Heru Sukanto
Keyword(s):  
Face Milling ◽  
Pocket Milling ◽  
Slot Milling ◽  
Cad Cam ◽  
Thread Milling

Penelitian ini dilakukan untuk mengetahui pengaruh penerapan CAD /CAM terhadap proses penggilingan CNC terhadap kekasaran dan ketelitianpermukaan. Spesimen dibuat dengan menggunakan tujuh jenis prosespemotongan. Terdapat face milling, pocket milling, profile milling, slotmilling, pengeboran, thread milling dan surface contouring. Hasil penelitianmenunjukkan bahwa penerapan CAD / CAM dengan variasi prosespemotongan menghasilkan nilai kekasaran yang lebih rendah daripadatanpa penerapan CAD / CAM. Nilai kekasaran permukaan untuk masingmasingproses pemotongan adalah proses face milling (0,5028 μm; 0,5132μm), slot milling (0.664 μm; 0.6556 μm), profile milling (1.282 μm; 1.3128μm), pocket milling (1.3852 μm; 1.4856 μm ) Dan proses pengeboran(1.9944 μm; 2.1136 μm). Nilai rata-rata dimensi dari pengukuranmenunjukkan selisih antara hasil implementasi CAD / CAM dan tanpaimplementasi CAD / CAM. Persentase perbedaan panjang dan lebarmasing-masing 0,037%; 0,059% untuk profile milling; 0,039%; 0,061%untuk pocket milling; Dan 0.151%; 0,317% untuk pengeboran Penggunaanstatistik penerapan CAD / CAM tidak secara signifikan mempengaruhi nilaikekasaran permukaan namun memiliki pengaruh signifikan terhadapketepatan produk dengan tingkat presisi 95%.

Effects of structural inhomogeneities on the steel balls resistance to loading

2020 ◽  
pp. 29-38
Author(s):  
O. B. Berdnik ◽  
I. N. Tsareva ◽  
L. A. Krivina ◽  
S. V. Kirikov ◽  
S. I. Gerasimov ◽  
...  
Keyword(s):  
Brittle Fracture ◽  
Bearing Steel ◽  
Metallographic Analysis ◽  
Structural Factors ◽  
Steel Shkh15 ◽  
Maximum Hardness ◽  
High Shock ◽  
Steel Balls ◽  
Plasticity Coefficient ◽  
Microstructure Of The Material

When conducting impact tests of protective glasses, nonunique cases of destruction of balls made of bearing steel ShKh15 were recorded. The causes of their destruction were determined. The state of the material was studied by fractographic and metallographic analysis, hardness and microhardness measurement. In the structure of the metal of all the balls, no critical defects were found such as flockens, shells and microcracks, but adverse factors were detected in the microstructure of the material, namely, the presence of fineneedle martensite with excessive carbides. It is established that the detected structural factors lead to liability to brittle fracture, an increase in the hardness of the material, a decrease in plasticity. To prevent brittle fracture of the balls and provide a reserve of plasticity of steel ShKh15 at high shock loads assessment calculations of ductility coefficient were made; and it was recommended to limit the maximum hardness of the material critical value HV=5.70 HPa (54 HRC), with the corresponding plasticity coefficient equal to 0.8.

Effect of tool wear on the surface integrity of Inconel 718 in face milling with cemented carbide tools

Wear ◽  
2021 ◽  
pp. 203752
Author(s):  
A.R.F. Oliveira ◽  
L.R.R. da Silva ◽  
V. Baldin ◽  
M.P.C. Fonseca ◽  
R.B. Silva ◽  
...  
Keyword(s):  
Tool Wear ◽  
Surface Integrity ◽  
Inconel 718 ◽  
Face Milling ◽  
Cemented Carbide ◽  
Cemented Carbide Tools

scholarly journals Optimum Selection of Variable Pitch for Chatter Suppression in Face Milling Operations

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 112 ◽  
Author(s):  
Alex Iglesias ◽  
Zoltan Dombovari ◽  
German Gonzalez ◽  
Jokin Munoa ◽  
Gabor Stepan
Keyword(s):  
Removal Rate ◽  
Face Milling ◽  
Heavy Duty ◽  
Variable Pitch ◽  
Thin Walls ◽  
Chatter Suppression ◽  
Milling Operations ◽  
Optimum Selection ◽  
Cutting Capacity ◽  
Selection Of

Cutting capacity can be seriously limited in heavy duty face milling processes due to self-excited structural vibrations. Special geometry tools and, specifically, variable pitch milling tools have been extensively used in aeronautic applications with the purpose of removing these detrimental chatter vibrations, where high frequency chatter related to slender tools or thin walls limits productivity. However, the application of this technique in heavy duty face milling operations has not been thoroughly explored. In this paper, a method for the definition of the optimum angles between inserts is presented, based on the optimum pitch angle and the stabilizability diagrams. These diagrams are obtained through the brute force (BF) iterative method, which basically consists of an iterative maximization of the stability by using the semidiscretization method. From the observed results, hints for the selection of the optimum pitch pattern and the optimum values of the angles between inserts are presented. A practical application is implemented and the cutting performance when using an optimized variable pitch tool is assessed. It is concluded that with an optimum selection of the pitch, the material removal rate can be improved up to three times. Finally, the existence of two more different stability lobe families related to the saddle-node and flip type stability losses is demonstrated.

Theoretical Surface Roughness Model in High Speed Face Milling

2014 ◽  
Vol 989-994 ◽  
pp. 3331-3334
Author(s):  
Tao Zhang ◽  
Guo He Li ◽  
L. Han
Keyword(s):  
Surface Roughness ◽  
Surface Integrity ◽  
High Speed ◽  
Cutting Parameters ◽  
Angular Speed ◽  
Face Milling ◽  
Advanced Manufacturing ◽  
Roughness Model ◽  
Machined Parts ◽  
Important Object

High speed milling is a newly developed advanced manufacturing technology. Surface integrity is an important object of machined parts. Surface roughness is mostly used to evaluate to the surface integrity. A theoretical surface roughness model for high face milling was established. The influence of cutting parameters on the surface roughness is analyzed. The surface roughness decreases when the cutter radius increases, total number of tooth and rotation angular speed, while it increases with the feeding velocity. The high speed face milling can get a smooth surface and it can replace the grinding with higher efficiency.

Variation in the coercive force under static tension and fatigue loading of specimens of steel ShKh15

2012 ◽  
Vol 44 (3) ◽  
pp. 333-336
Author(s):  
V. M. Matsevityi ◽  
G. Ya. Bezlyud’ko ◽  
I. B. Kazak ◽  
K. V. Vakulenko ◽  
E. V. Belous
Keyword(s):  
Coercive Force ◽  
Fatigue Loading ◽  
Static Tension ◽  
Steel Shkh15
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