Investigation of Drilling Machinability of Compacted Graphite Iron under Dry and Minimum Quantity Lubrication (MQL)

Compacted graphite iron (CGI), which is used as a potential material in the auto industry, is a hard-to-machine material for the different minor elements and for the geometry of graphite with grey cast iron. The machinability of CGI in the drilling process was investigated with a 4-mm diameter fine-grain carbide twist drill under four lubrication conditions, dry (no compressed air), dry (with compressed air), MQL 5 ml/h, and MQL 20 mL/h in this paper. The maximum flank wear, types of wear, and cutting loads were studied for identifying the wear mechanism in drilling of CGI. The tool life in the four experiments of CGI drilling is 639 holes, 2969 holes, 2948 holes, and 2685 holes, respectively. The results showed that the main wear mechanism in drilling of CGI is adhesion and abrasion. Carbon, which originates from the graphite of CGI, can improve the lubrication in the drilling process by comparing with MnS in drilling grey cast iron. The thrust force and torque are more than 1000 N and 150 N*cm after 2700 holes in CGI drilling. Drilling of CGI under dry conditions (with compressed air) and MQL 5 ml/h is feasible.

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Investigation of the wear mechanism of cubic boron nitride tools used for the machining of compacted graphite iron and grey cast iron

International Journal of Refractory Metals and Hard Materials ◽

10.1016/s0263-4368(00)00032-9 ◽

2000 ◽

Vol 18 (6) ◽

pp. 287-296 ◽

Cited By ~ 34

Author(s):

M Gastel ◽

C Konetschny ◽

U Reuter ◽

C Fasel ◽

H Schulz ◽

...

Keyword(s):

Cast Iron ◽

Boron Nitride ◽

Wear Mechanism ◽

Cubic Boron Nitride ◽

Grey Cast Iron ◽

Compacted Graphite Iron ◽

Compacted Graphite ◽

Grey Cast

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Analytical investigations concerning the wear behaviour of cutting tools used for the machining of compacted graphite iron and grey cast iron

International Journal of Refractory Metals and Hard Materials ◽

10.1016/j.ijrmhm.2007.05.003 ◽

2008 ◽

Vol 26 (3) ◽

pp. 197-206 ◽

Cited By ~ 38

Author(s):

M. Heck ◽

H.M. Ortner ◽

S. Flege ◽

U. Reuter ◽

W. Ensinger

Keyword(s):

Cast Iron ◽

Cutting Tools ◽

Grey Cast Iron ◽

Wear Behaviour ◽

Compacted Graphite Iron ◽

Compacted Graphite ◽

Grey Cast

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SIMS Analysis of the wear of boron nitride tools for the machining of compacted graphite iron and grey cast iron

Fresenius Journal of Analytical Chemistry ◽

10.1007/s002160051460 ◽

1999 ◽

Vol 365 (1-3) ◽

pp. 142-146 ◽

Cited By ~ 9

Author(s):

M. Gastel ◽

U. Reuter ◽

H. Schulz ◽

H. M. Ortner

Keyword(s):

Cast Iron ◽

Boron Nitride ◽

Grey Cast Iron ◽

Compacted Graphite Iron ◽

Compacted Graphite ◽

Grey Cast ◽

Sims Analysis

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Wear Mechanism of CBN Inserts During Machining of Bimetal Aluminum-grey Cast Iron Engine Block

Procedia CIRP ◽

10.1016/j.procir.2013.06.087 ◽

2013 ◽

Vol 8 ◽

pp. 188-193 ◽

Cited By ~ 14

Author(s):

Amir Malakizadi ◽

Ibrahim Sadik ◽

Lars Nyborg

Keyword(s):

Cast Iron ◽

Wear Mechanism ◽

Grey Cast Iron ◽

Engine Block ◽

Grey Cast

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Tool Life and Wear Mechanism of Coated Si3N4 Ceramic Tools in Turning Grey Cast Iron

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.581.14 ◽

2013 ◽

Vol 581 ◽

pp. 14-17 ◽

Cited By ~ 10

Author(s):

Valery V. Kuzin ◽

Sergey N. Grigoriev

Keyword(s):

Cast Iron ◽

Wear Mechanism ◽

Grey Cast Iron ◽

Ceramic Surface ◽

Finish Turning ◽

High Effectiveness ◽

Ceramic Tools ◽

Layered Coating ◽

Grey Cast ◽

A Chain

This paper presents results of the investigation of Si3N4 ceramic inserts with CVD coatings in turning grey cast iron. The high effectiveness of Si3N4 ceramic inserts with multi-layered coating in the finish turning of the grey irons was shown. It was established that at the heart of the wear mechanism of coated Si3N4 ceramic inserts there is a chain of relations cutting conditions loading fracture of coating сhipping of ceramic surface layer failure of tools. One of the important features of wear mechanism of these tools is the operational defects formed at the coating substrate interface.

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Influence of Shot Peening Parameters on Residual Stresses in Flake and Vermicular Cast Irons

Materials Science Forum ◽

10.4028/www.scientific.net/msf.768-769.534 ◽

2013 ◽

Vol 768-769 ◽

pp. 534-541 ◽

Cited By ~ 10

Author(s):

Matthias Lundberg ◽

Ru Lin Peng ◽

Maqsood Ahmad ◽

Taina Vuoristo ◽

Daniel Bäckström ◽

...

Keyword(s):

Cast Iron ◽

Residual Stresses ◽

Shot Peening ◽

High Surface ◽

Lower Surface ◽

Grey Cast Iron ◽

Cast Irons ◽

Compacted Graphite ◽

Grey Cast ◽

Compressive Residual Stresses

Test samples of grey and compacted graphite cast irons with pearlitic matrix were shot-peened to different surface conditions using twelve different combinations of shot size, peening intensity and peening coverage percentage. Relatively high surface compressive residual stresses varying between 245 to 565 MPa were observed and the compressive residual stresses reached a depth between 280 µm and 770 µm. Within the range of peening parameters used, the compacted graphite cast iron with its vermicular graphite showed a somewhat better response to the same shot-peening treatment than the grey cast iron containing flake graphite, giving a larger peening affected zone with higher compressive residual stresses. For both the cast irons, an increase in peening coverage percentage, shot size or peening intensity led often to a lower surface compressive stress. However, peening using a higher intensity greatly increased the degree and extent of plastic deformation and therefore increased the magnitude and penetration depth of the subsurface compressive residual stresses, while the effect of increasing shot size also depends on the peening intensity. On the other hand, measurements on the grey cast iron samples showed that the peening coverage has little effect on the depth profile of residual stress.

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